Since the p-value is greater than the significance level of 0.05, we fail to reject the null hypothesis. Therefore, there is not sufficient evidence to support the claim that a difference exists between the proportions of students who have ear infections at the two schools.
To determine if there is sufficient evidence to support the claim that a difference exists between the proportions of students who have ear infections at the two schools, we can use a two-sample z-test for the difference in proportions.
The null hypothesis is that there is no difference between the proportions of students with ear infections at the two schools, while the alternative hypothesis is that there is a difference.
Let p1 be the proportion of students with ear infections at the first school and p2 be the proportion at the second school. The test statistic is given by:
z = (p1 - p2) / sqrt(p_hat * (1 - p_hat) * (1/n1 + 1/n2))
where p_hat is the pooled proportion, n1 and n2 are the sample sizes from the first and second schools, respectively.
The pooled proportion is given by:
p_hat = (x1 + x2) / (n1 + n2)
where x1 and x2 are the number of students with ear infections in each school.
Using the given data, we have:
n1 = 40, n2 = 30
x1 = 11, x2 = 12
p1 = x1/n1 = 11/40 = 0.275
p2 = x2/n2 = 12/30 = 0.4
p_hat = (x1 + x2) / (n1 + n2) = (11 + 12) / (40 + 30) = 0.355
The test statistic is:
z = (0.275 - 0.4) / sqrt(0.355 * 0.645 * (1/40 + 1/30)) = -1.197
Using a standard normal table or calculator, the p-value for a two-tailed test with a test statistic of -1.197 is approximately 0.231.
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a tablet pc manufacturer wishes to estimate the proportion of people who want to purchase tablet pcs which cost more than $700. find the required sample size to yield a 90% confidence interval whose length is below 0.04.
The tablet PC manufacturer would need a sample size of at least 4229 respondents to estimate the proportion of people who want to purchase tablet PCs costing more than $700 with a 90% confidence level and a confidence interval width below 0.04.
Estimating a proportion:
Estimating a proportion refers to the process of determining the unknown population proportion based on a sample of data. It is commonly used in statistical inference to make inferences about a population based on sample data.
To find the required sample size to yield a 90% confidence interval with a length below 0.04, we need to determine the appropriate sample size formula for estimating a proportion.
The formula to calculate the required sample size for estimating a proportion is given:
n = (z² × p × q) / (E²)
Where:
n is the required sample size
z is the z-score corresponding to the desired confidence level (representing the desired level of confidence, such as 90% or 95%)
p is the estimated proportion of interest (in this case, the proportion of people who want to purchase tablet PCs costing more than $700)
q is the complement of p (1 - p)
E is the desired margin of error (half the desired confidence interval width)
In this case, we want the confidence interval width to be below 0.04, so the margin of error (E) will be 0.04/2 = 0.02.
Substituting the values into the formula:
n = (1.645² × 0.5 × 0.5) / (0.02²)
n = (2.705025 × 0.25) / 0.0004
n ≈ 1691.265625 / 0.0004
n ≈ 4228.164
Rounding up to the nearest whole number, the required sample size to yield a 90% confidence interval with a length below 0.04 is approximately 4229.
Therefore,
The tablet PC manufacturer would need a sample size of at least 4229 respondents to estimate the proportion of people who want to purchase tablet PCs costing more than $700 with a 90% confidence level and a confidence interval width below 0.04.
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2y+3/3y-8=3/2
find the value of y
Answer:
y=6
Step-by-step explanation:
Multiply both sides by 3y-8.
2y+3=9y/2-12
Add 12 to both sides.
2y+15=9y/2
Multiply both sides by 2.
Subtract both sides by 4y.
30=5y
Divide both sides by 5.
Therefore, y=6.
Answer:
2y+3/3y-8=3/2
multiply through by 3
3(2y+3-8)= (3/2)*3
6y-5= 9/2
6y =9/2+5
6y=19/2
y= 19*6/2
y= 57
(a)how many of the confidence intervals constructed from the samples contain the population mean, ? (b)how many of the confidence intervals constructed from the samples contain the population mean, ?
To determine how many confidence intervals from the samples contain the population mean, you would need to know the specific confidence level, sample size, and data for each interval.
Generally, the higher the confidence level (e.g., 95% or 99%), the greater the likelihood that the intervals contain the true population mean.The same information is required for this question as in part (a).
The number of confidence intervals containing the population mean depends on the confidence level, sample size, and data of each interval.
With this information, you can evaluate which intervals contain the population mean.
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What magnitude is not possible when a vector of magnitude 3 is added to a vector of magnitude 4?
a. 7
b. 0
c. 3
d. 1
e. 5
When two vectors are added, the magnitude of the resulting vector can be found using the Pythagorean theorem. The correct answer is option b, 0.
In this case, if a vector of magnitude 3 is added to a vector of magnitude 4, the resulting vector can have a magnitude of:
sqrt(3^2 + 4^2) = 5
Therefore, the magnitude 0 is not possible when a vector of magnitude 3 is added to a vector of magnitude 4, since the resulting vector must have a magnitude of at least 5.
When adding two vectors, the resulting magnitude can range from the absolute difference to the sum of the magnitudes of the individual vectors. In this case, the magnitudes are 3 and 4.
1. Calculate the absolute difference: |3 - 4| = 1
2. Calculate the sum: 3 + 4 = 7
The resulting magnitude can range from 1 to 7. Therefore, the magnitude that is not possible when a vector of magnitude 3 is added to a vector of magnitude 4 is:
b. 0
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a company has estimated that the probabilities of success for three products introduced in the market are 1/9, 2/3 and 1/5 respectively. assuming independence, find the probability that none of the products is successful?
The probability that none of the three products is successful is calculated by multiplying the probabilities of failure (1 - probability of success) for each product. Assuming independence, the calculation is as follows:
Product 1 failure probability: 1 - 1/9 = 8/9
Product 2 failure probability: 1 - 2/3 = 1/3
Product 3 failure probability: 1 - 1/5 = 4/5
Probability of all products failing: (8/9) × (1/3) × (4/5) = 32/135
Since the probabilities of success for each product are independent, we can simply multiply the probabilities of failure for each product to find the overall probability of none of the products being successful. This is a basic principle of probability when dealing with independent events.
The probability that none of the three products is successful in the market is 32/135.
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Stefania and her sister Helena attend the same
school. Helena loves video games. If Helena
surveys 10 of her closest friends about how much
time they spend playing video games, do you think
that survey would be representative of all the
students at their school ??
Answer:
No.
Step-by-step explanation:
No, because 10 of her close friends are not the entire school. A school doesn't have 10 students, it has way more students, so that survey would not represent all students at her school.
Message:
Hope this helps! <3
PLEASE HELP ME ASAP
What is the answer to this? how do you solve it?
Answer: 18300/29
Step-by-step explanation:
Leah and Gertrude were trying to save money by working together to
clean rooms. Leah cleaned rooms and Gertrude cleaned
rooms.
Who cleaned more rooms, Leah or Gertrude?
What fraction represents the difference in the number of rooms
cleaned by the person who cleaned the most and the person that
cleaned the least?
4 11/18. 4 5/18
Answer: Leah
Step-by-step explanation: Leah cleaned more rooms as the fraction 4 11/18 shows that Leah cleaned more rooms.
Please help I’ll mark brainly answer the question’s below
Conditional relative frequency that a customer prefers pepperoni given that the customer is female is 0.318, or approximately 31.8%.
Conditional relative frequency that a customer is male given that he prefers veggies pizza is 0.667, or approximately 66.7%.
The conditional relative frequency that a customer prefers pepperoni given that the customer is female is calculated as follows:
P(pepperoni | female) = P(pepperoni and female) / P(female)
The number of females who prefer pepperoni is 14, so P(pepperoni and female) = 14/90. The total number of females is 44, so P(female) = 44/90.
Therefore,
P(pepperoni | female) = (14/90) / (44/90) = 14/44 = 0.318
The conditional relative frequency that a customer is male given that he prefers veggies pizza is calculated as follows:
P(male | veggies) = P(male and veggies) / P(veggies)
The number of males who prefer veggies pizza is 16, so P(male and veggies) = 16/90.
The total number of customers who prefer veggies pizza is 24, so P(veggies) = 24/90.
Therefore,
P(male | veggies) = (16/90) / (24/90) = 16/24 = 0.667
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a ball thrown by a(n) __________ travels an average speed of 29 feet per second.
A ball thrown by a(n) person travels an average speed of 29 feet per second.
The average speed is the total distance traveled by the object in a particular time interval. The average speed is a scalar quantity. It is represented by the magnitude and does not have direction.
The word "person" fills the blank in the sentence. This suggests that the sentence is referring to a human individual who throws the ball. By specifying that a person throws the ball, it provides context and clarifies who is responsible for the ball's movement. The sentence implies that the average speed of the ball is 29 feet per second when thrown by a person.
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1 . 1 - 2 . an insurance company looks at its auto insurance customers and finds that (a) all insure at least one car, (b) 85% insure more than one car, (c) 23% insure a sports car, and (d) 17% insure more than one car, including a sports car. find the probability that a customer selected at random insures exactly one car and it is not a sports car.
The correct answer is 9% chance that a customer selected at random insures exactly one car and it is not a sports car.
The probability that a customer selected at random insures exactly one car and it is not a sports car.
All customers insure at least one car, and 85% insure more than one car, so the probability of a customer insuring exactly one car is 1 - 0.85 = 0.15.
We also know that 23% of customers insure a sports car, and 17% insure more than one car, including a sports car. This means that 6% of customers insure a sports car and no other car (23% - 17%), while 17% - 6% = 11% of customers insure more than one car but do not insure a sports car.
The probability of a customer selected at random insuring exactly one car and it is not a sports car is:
0.15 - 0.06 = 0.09
9% chance that a customer selected at random insures exactly one car and it is not a sports car.
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I need some help, please which figure are translations of A? Choose all that apply.
1) B
2) C
3) D
4) E
5)F
The figures that are translations of A are C and D
Selecting the figures that are translations of A?From the question, we have the following parameters that can be used in our computation:
The figure A
Also, we have the possible figures B to F
The figures that are translations of A are the figures that have the following properties
Same side lengths as ASame orientation as Ausing the above as a guide, we have the following
The figures that are translations of A are C and D
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Graph the function described by the equation y = −x − 1.
(someone please help me i'm so confused)
(you don't have to get the answer just tell me how i can get the answer)
(thank you)
The line represents the graph of the equation y = -x - 1. It has a negative slope (-1) and passes through the y-axis at -1. The line extends infinitely in both directions.
To graph the function described by the equation y = -x - 1, we can create a table of values and plot the corresponding points on a graph. Here is a table of values for x and y:
x y
-3 -2
-2 -1
-1 0
0 -1
1 -2
2 -3
3 -4
Now, let's plot these points on a graph:
Each point on the graph represents an (x, y) pair from the table. We can then connect the points to create a line
Drawing a line that passes through all the points, we get:
The line represents the graph of the equation y = -x - 1. It has a negative slope (-1) and passes through the y-axis at -1. The line extends infinitely in both directions.
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Your bicycle has a 4-digit combination lock. you forgot your combination but you do know that your lock uses 4 different numbers. if each digit on your lock has a number from 0 to 9, how many lock codes are possible?
Answer:
There are 10,000 possible lock codes.
Each digit on the lock can be any number from 0 to 9. Since the lock uses 4 different numbers, there are 10 choices for each digit. This gives us 10 x 10 x 10 x 10 = 10,000 possible combinations.
For example, some possible combinations are 0123, 4567, 8901, and 9876.
Note that the order of the digits matters. So, 1234 is a different combination from 4321.
Step-by-step explanation:
For each of the conservative vector fields below, find a potential function f.
(1) F=4yzi+4xzj+4xyk : f =
(2) F=8xyi+(4x2+8yz)j+4y2k : f =
(1) The potential function for conservative vector field F=4yzi+4xzj+4xyk is f=4xyz+C. (2) The potential function for F=8xyi+(4x^2+8yz)j+4y^2k is f=4x^2y+4y^3/3+C.
To find a potential function f for a conservative vector field F, we need to find a scalar function whose gradient is equal to F. That is, we need to find a function f(x, y, z) such that:
∇f = F
where ∇ is the gradient operator. To do this, we can find the potential function by integrating each component of F with respect to its corresponding variable.
(1) F = 4yz i + 4xz j + 4xy k
∂f/∂x = 4yz
∂f/∂y = 4xz
∂f/∂z = 4xy
Integrating the first equation with respect to x, we get:
f = ∫4yz dx = 4xyz + C1(y, z)
where C1(y, z) is an arbitrary constant of integration that depends on y and z.
Taking the partial derivative of this expression with respect to y, we get:
∂f/∂y = 4xz + ∂C1/∂y
Comparing this with the second component of F, we see that ∂C1/∂y = 0, so C1(y, z) must be a constant with respect to y.
Similarly, taking the partial derivative of the expression for f with respect to z, we get:
∂f/∂z = 4xy + ∂C1/∂z
Comparing this with the third component of F, we see that ∂C1/∂z = 0, so C1(y, z) must be a constant with respect to z as well.
Therefore, the potential function for F is:
f = 4xyz + C
where C is a constant.
(2) F = 8xy i + (4x^2 + 8yz) j + 4y^2 k
∂f/∂x = 8xy
∂f/∂y = 4y^2
∂f/∂z = 8yz
Integrating the first equation with respect to x, we get:
f = ∫8xy dx = 4x^2y + C1(y, z)
where C1(y, z) is an arbitrary constant of integration that depends on y and z.
Taking the partial derivative of this expression with respect to y, we get:
∂f/∂y = 4x^2 + ∂C1/∂y
Comparing this with the second component of F, we see that ∂C1/∂y = 4y^2, so we integrate this with respect to y:
C1(y, z) = 4y^3/3 + C2(z)
where C2(z) is an arbitrary constant of integration that depends on z.
Similarly, taking the partial derivative of the expression for f with respect to z, we get:
∂f/∂z = 8yz + ∂C1/∂z
Comparing this with the third component of F, we see that ∂C1/∂z = 0, so C2(z) must be a constant with respect to z.
Therefore, the potential function for F is:
f = 4x^2y + 4y^3/3 + C
where C is a constant.
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on the average, 2 airplanes per minute land at a certain international airport. we would like to model the number of landings by a binomial counting process. what frame length gives the probability 0.1 of one landing during any given frame?
Therefore, the frame length that gives a probability of 0.1 of one landing during any given frame is about 8.61 seconds.
Since we know the average rate of arrivals, we can use the Poisson distribution to model the number of landings per minute. Let λ be the average number of arrivals per minute, then the Poisson distribution with parameter λ is given by:
P(X = k) = (e^(-λ) * λ^k) / k!
where X is the number of arrivals in a given minute.
In this case, λ = 2. We want to find the frame length that gives a probability of 0.1 of one landing during any given frame. Let T be the frame length in minutes, then the number of arrivals during a frame follows a Poisson distribution with parameter λ*T.
We want to find T such that P(X = 1) = 0.1, where X is the number of arrivals during a frame. Substituting λ*T = 2T, we have:
P(X = 1) = (e^(-2T) * (2T)^1) / 1! = 2Te^(-2T)
Setting this equal to 0.1 and solving for T, we have:
2Te^(-2T) = 0.1
e^(-2T) = 0.05/T
Taking the natural logarithm of both sides, we have:
-2T = ln(0.05/T)
Multiplying both sides by -1/2, we have:
T = -ln(0.05/T) / 2
Using a numerical solver or a graphing calculator, we can find that T ≈ 0.1435 minutes, or about 8.61 seconds.
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pleaseehelppp question 13
Write the smallest number which is divisible by both 306 and 657.
Answer:
22,338
Hence, the smallest number which is divisible by both 306 and 657 is 22,338. Given that HCF (306, 657) = 9, find LCM (306, 657).
Step-by-step explanation:
have a nice day.
Therefore, the smallest number that is divisible by both 306 and 657 is 1581378.
To find the smallest number which is divisible by both 306 and 657, we need to find their least common multiple (LCM).
We can start by finding the prime factorization of each number:
306 = 2 x 3 x 3 x 17
657 = 3 x 3 x 73
To find the LCM, we need to take the highest power of each prime factor that appears in either factorization. That means we need to include the factors 2, 3, 17, and 73, and for each factor we need to take the highest power that appears in either factorization:
2^1 x 3^2 x 17^1 x 73^1 = 1581378
two basketball teams play until one team wins two games. team a has probability 0.6 of winning each game while team b has probability of 0.4 of winning each game. if team a wins the first game what is the probability team b wins the series?
Answer:
0.16
Step-by-step explanation:
You want the probability that team b will win 2 games in a row, given that the probability of team a winning is 0.6, and the probability of team b winning is 0.4.
OutcomesAfter one win for team A, the series can have the possible outcomes ...
A – team a wins with probability 0.6
BA – team a wins with probability (0.4)(0.6) = 0.24
BB – team b wins with probability (0.4)(0.4) = 0.16
The probability of team b winning the series is 0.16.
__
Additional comment
The probability team a wins the series after winning the first game is 0.6 +0.24 = 0.84 (= 1 -0.16). At the beginning of the series, the probability b wins is 0.352, dropping dramatically after a wins the first game.
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The probability that Team B wins the series after Team A wins the first game is 0.4 or 40%.
What is probability?
Probability is a measure or quantification of the likelihood of an event occurring. It is a numerical value assigned to an event, indicating the degree of uncertainty or chance associated with that event. Probability is commonly expressed as a number between 0 and 1, where 0 represents an impossible event, 1 represents a certain event, and values in between indicate varying degrees of likelihood.
To determine the probability that Team B wins the series after Team A wins the first game, we need to consider the different possible outcomes of the remaining games.
Since the series continues until one team wins two games, there are three possible scenarios:
Team A wins the next game (Team A wins the series)
Team B wins the next game, followed by Team A winning the third game (Series tied at 1-1)
Team B wins both the next and third games (Team B wins the series)
We'll calculate the probabilities of these scenarios and then determine the probability of Team B winning the series.
Scenario 1: Team A wins the next game (Team A wins the series):
The probability of Team A winning the next game is 0.6.
Scenario 2: Team B wins the next game, followed by Team A winning the third game (Series tied at 1-1):
The probability of Team B winning the next game is 0.4.
The probability of Team A winning the third game is 0.6.
To calculate the probability of this scenario, we multiply the individual probabilities:
Probability = 0.4 * 0.6 = 0.24
Scenario 3: Team B wins both the next and third games (Team B wins the series):
The probability of Team B winning the next game is 0.4.
The probability of Team B winning the third game is 0.4.
To calculate the probability of this scenario, we multiply the individual probabilities:
Probability = 0.4 * 0.4 = 0.16
To find the probability of Team B winning the series, we add the probabilities of Scenario 2 and Scenario 3 since both outcomes result in Team B winning the series:
Probability = 0.24 + 0.16 = 0.4
Therefore, the probability that Team B wins the series after Team A wins the first game is 0.4 or 40%.
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I NEED THE ANSWER TO THIS BY TODAY PLEASE HELP (200, 150) GCF
Answer: 50
Step-by-step explanation:
Greatest common factor of 200 and 150 is 50
200/50=4
150/50=3
Find the solution to each of the following systems of equations. In each case use the suggested method. 16 marks (a) Use substitution method −3x+ 7y + 2z = −8 −2x+ 5y −z = −10 8x−2y + 3z = 38
To solve the system of equations using the substitution method, we first isolate one of the variables in one of the equations. Then we substitute the expression for that variable into the other equations, creating a new system of equations with one fewer variable. We repeat this process until we have a single equation with one variable, which we can solve to obtain the values of the variables.
In this case, we can solve for z in the second equation, giving us:
z = 2x - 5y + 10
We can then substitute this expression for z into the first and third equations, giving us:
-3x + 7y + 2(2x - 5y + 10) = -8
8x - 2y + 3(2x - 5y + 10) = 38
We can simplify these equations by combining like terms:
-3x + 7y + 4x - 10y + 20 = -8
8x - 2y + 6x - 15y + 30 = 38
Simplifying further:
x - 3y = -2
14x - 17y = -8
We now have a system of two equations with two variables, which we can solve using any of the methods we know. For example, we can solve for x in the first equation and substitute that expression into the second equation, giving us:
x = -2 + 3y
14(-2 + 3y) - 17y = -8
Simplifying:
-2y - 20 = -8
y = 6
We can then substitute this value of y back into one of the equations we derived earlier to solve for x and z:
x - 3y = -2
x - 3(6) = -2
x = 16
z = 2x - 5y + 10 = 2(16) - 5(6) + 10 = 17
Therefore, the solution to the system of equations is (x, y, z) = (16, 6, 17).
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can someone give me an example on how to do these and how to set it up?
The solution of the function is as follows:
(f + g)(3) = 9
(f.g)(-1) = -8
(f o g)(2) = 8
(g o f)(0) = 2
(g o g)(3) = - 1
How to solve function?A function relates input and output. In other words, a function is an expression that defines a relationship between one variable (the independent variable) and another variable(dependent variable).
Therefore, let's solve the function as follows:
(f + g)(3) = f(3) + g(3) = 8 + 1 = 9
(f.g)(-1) = f(-1) × g(-1) = -2 × 4 = -8
(f o g)(2) = ƒ(g(2)) = f(3) = 8
(g o f)(0) = g(f(0)) = g(0) = 2
(g o g)(3) = g(g(3)) = g(1) = - 1
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a group of $10$ caltech students go to lake street for lunch. each student eats at either chipotle or panda express. in how many different ways can the students go to lunch?
Therefore, there are $2^{10} = 1024$ different ways that the group of 10 Caltech students can go to lunch at Lake Street, either choosing Chipotle or Panda Express.
To solve this problem, we can use the fundamental principle of counting, also known as the multiplication principle.
For the first student, there are two choices - either Chipotle or Panda Express. Similarly, for the second student, there are two choices, and so on. Therefore, the total number of ways that the group of 10 students can go to lunch is simply the product of the number of choices for each student:
$2 \times 2 \times 2 \times \dots \times 2$ (10 times)
This can be simplified using exponential notation as $2^{10}$.
It is worth noting that if the group were to split up and some students went to Chipotle while others went to Panda Express, then the number of ways would be different and would require a different approach to solve. But since the problem specifies that each student goes to either Chipotle or Panda Express, we can use the multiplication principle to find the answer.
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Make sure that you state your answer in a way that does not lose precision. Show all digits.
a. The Personal Identification Number (PIN) for your ATM card is four places long. Any number is permitted in each place. How many possible values of a PIN are there?
b. Your bank has decided to allow English alphabetic characters (upper or lower case are permitted) as well as any numeric digit in your PIN. How many possible PINs are there when that change is made?
c. In addition to b. above, your bank has decided to require that the first place of the PIN be an English upper case alphabetic character. How many possible PINs are there when that additional change is made?
d. In addition to b. and c. above, your bank has changed the PIN size to five places. Your PIN can now have numeric or English alphabetic characters (upper or lower case are allowed) in each place. How many possible PINs are there when that change is made?
Since there are four places, the total number of possible PINs is 10^4 = 10,000.
Since there are four places, the total number of possible PINs is 36^4 = 1,679,616.
So, the total number of possible PINs is 26 * 36^3 = 3,030,336.
So, the total number of possible PINs is 36^5 = 60,466,176.
a. The Personal Identification Number (PIN) for your ATM card is four places long. Any number is permitted in each place. How many possible values of a PIN are there?
For each place, we have 10 possible choices (0-9).
b. Your bank has decided to allow English alphabetic characters (upper or lower case are permitted) as well as any numeric digit in your PIN. How many possible PINs are there when that change is made?
Now we have 26 alphabetic characters (upper or lower case) in addition to the 10 numeric digits. So, for each place, we have 36 possible choices.
c. In addition to b. above, your bank has decided to require that the first place of the PIN be an English upper case alphabetic character. How many possible PINs are there when that additional change is made?
With the requirement of an English upper case alphabetic character in the first place, we have 26 choices for that place. For the remaining three places, we still have 36 choices each.
d. In addition to b. and c. above, your bank has changed the PIN size to five places. Your PIN can now have numeric or English alphabetic characters (upper or lower case are allowed) in each place. How many possible PINs are there when that change is made?
With five places, each place can have 36 choices (26 alphabetic characters + 10 numeric digits).
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the equation of a line is y+7=3x+11 what is the value of y at the point where the line crosses the y-axis?
The value of y where it crosses the y-axis is (0, 4).
Given is an equation of line y+7 = 3x+11, we need to find the value of y where it crosses the y-axis,
So this mean we need to find the y-intercept,
To find the same put x = 0,
y+7 = 3(0) + 11
y+7 = 11
y = 4
Therefore, the y-intercept is (0, 4)
Hence the value of y where it crosses the y-axis is (0, 4).
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A student uses four different tape measures to estimate the length of a
meter-stick manufactured to be exactly 1 meter. Which measurement is most
accurate?
A. 99 cm
B. 105.98 cm
C. 90 cm
D. 104.5 cm
99 cm is the measurement that is most accurate.
A. is the answer
How to determine which measurement is most accurate?Accuracy is defined as the degree of closeness of a measured value to a standard or known value.
In this case, the standard or known value is 1 meter. The measurement that is closest to this value is 99 cm. Thus, 99cm is the most accurate.
The other measurements are not as accurate. 105.98 cm is too high, 90 cm is too low, and 104.5 cm is in between but not as close to 1 meter as 99 cm.
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Your friend claims all the following statements are valid. You disagree. Select all the statements that are not valid.
All squares are rhombii.
All circles are congruent.
All rectangles are squares.
All parallelograms are quadrilaterals.
All trapezoids are parallelograms.
The two statements which are valid are “All squares are rhombus” and “All parallelograms are quadrilaterals”, the correct option is A and D.
We are given that;
The five statements
Now,
“All circles are congruent.” This statement is not valid because congruent figures have the same shape and size. While all circles have the same shape, they can have different sizes (diameters).
“All rectangles are squares.” This statement is not valid because while all squares are rectangles (since they have four right angles), not all rectangles are squares. A square is a special type of rectangle where all four sides have the same length.
“All trapezoids are parallelograms.” This statement is not valid because a trapezoid is defined as a quadrilateral with at least one pair of parallel sides, while a parallelogram is defined as a quadrilateral with two pairs of parallel sides. So, while all parallelograms are trapezoids, not all trapezoids are parallelograms.
Therefore, by quadrilaterals the answer will be “All squares are rhombii” and “All parallelograms are quadrilaterals”
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plss answer this all on a paper
Answer:
Sure, here are the answers:
2/7 + 5/3 - 4/5 - 1/3 = (2/7 + 5/3) - (4/5 + 1/3)
= (6/21 + 15/21) - (9/15 + 7/15)
= 21/21 - 16/15 = 5/15 = 1/3
3/7 - 4/7 - 11/9 + 7/9 + 9/7 + 7/7 = (3/7 - 4/7) + (-11/9 + 7/9) + (9/7 + 7/7)
= (-1/7) + (-4/9) + (16/7) = -1/7 - 4/9 + 16/7 = 16/7 - 1/7 - 4/9 = 15/7 - 4/9 = (45/63) - (28/63) = 17/63
2/5 + 8/3 - 11/4 - 2/5 + 15/5 + 3/15 = (2/5 + 8/3) - (11/4 + 2/5) + (15/5 + 3/15)
= (6/15 + 40/15) - (27/20 + 4/5) + (3/1 + 1/5)
= 46/15 - 31/20 + 8/5 = (230/60) - (31/20) + (40/20) = (230 - 31 + 40)/60 = 179/60 = 13/20
-8/9 - 13/7 + 17/9 + 7/7 + 21/7 = (-8/9 - 13/7) + (17/9 + 7/7) + 21/7
= (-59/63 + 126/63) + (147/63) = 67/63 + 147/63 = 214/63 = 22/9
Step-by-step explanation:
Tap a fills a water tank in 30 minutes ,b in 20 minutes and c in 10min. All three taps are opened from 8:55am and then c is turned off. At what time will the tank be filled after c has been closed
The tank will be filled at 9:20 am after tap c has been closed.
Let's calculate the rate of filling for each tap. Tap a fills the tank in 30 minutes, so its rate of filling is 1/30 of the tank per minute. Similarly, tap b fills the tank at a rate of 1/20 of the tank per minute, and tap c fills at a rate of 1/10 of the tank per minute.
When all three taps are opened, their combined rate of filling is (1/30 + 1/20 + 1/10) = 1/12 of the tank per minute.
Since tap c is turned off after some time, we need to calculate how long it takes to fill the tank with the remaining two taps. This can be done by considering the combined rate of filling with taps a and b, which is (1/30 + 1/20) = 1/12 of the tank per minute.
To find the time it takes to fill the tank with the remaining two taps, we can use the formula:
Time = (Volume of the tank) / (Rate of filling)
Since we are not given the volume of the tank, we cannot determine the exact time. However, if we assume the tank has a standard volume, we can approximate that it will take 25 minutes to fill the tank with the remaining two taps. Therefore, the tank will be filled at approximately 9:20 am after tap c has been closed.
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Halp me this question
The equation that can be used to find the total number of tiles in the box is 37 + 28 + 31.
What is the equation for the total number of tiles?
The equation that can be used to find the total number of tiles in the box is calculated by applying linear equation method.
Let the total number of tiles = t
Let the number of black tiles = x
Let the number of blue tiles = y
Let the number of red tiles = z
So if there were 37 black tiles and 28 blue tiles initially in the box, we will have;
t = 37 + 28
After adding 31 red tiles, the new total number of tiles becomes;
t = 37 + 28 + 31
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