Answer:
$1,078
Step-by-step explanation:
The tax amount is taken out of his taxable income,
The tax amount is $1583.
What is tax?A tax is a mandatory contribution that a local, regional, or national government collects from individuals or businesses. Public works and services like roads and schools, as well as programs like Social Security and Medicare, are financed by tax revenue.
In economics, taxes go to whoever has to pay them, whether it's the entity being taxed, like a business, or the people who buy the goods from the business. Payroll taxes, federal and state income taxes, and sales taxes are just a few of the taxes to take into account from an accounting perspective.
Given
adjusted gross income = $26,045
exemption = $12,400
to find tax by taxable income
taxable income = adjusted gross income - exemption
taxable income = 26,045 - 12400
taxable income = $13,645
The question is incomplete, the table is attached
Therefore, I will employ the 2016 single taxable income tax bracket and rate table.
Using the table, the tax amount on an income of $13,645 is:
Tax = $927.50 + 15% × (Amount - $9275)
So, we get:
Tax = $927.50 + 15% ×($13645 - $9275)
$1583,
Hence, Allie's tax amount is $1583.
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The table for Question is in image attached.
tried solving it but can't find Q
Answer:
4.5 i think
Step-by-step explanation:
Solve the initial value problem
r''(t)=2/t^2, r'(1)=3, r(1)=-4
The value of t from the given derivative is 7.38.... or −7.38....
The given second order derivative is r''(t)=2/t².
What is the differentiation?The process of finding derivatives of a function is called differentiation in calculus. A derivative is the rate of change of a function with respect to another quantity.
Here, r''(t)=2/t²
The anti-derivative is
Set the function up in integral form and evaluate to find the integral.
r'(t) = -2/t
Now, 3=-2/t
⇒ t=-2/3
Set the function up in integral form and evaluate to find the integral.
r(t)=-2ln(|t|)
So, -4=-2ln(|t|)
Isolate the variable by dividing each side by factors that don't contain the variable.
Exact Form :t=e²,−e²
Decimal Form:
t=7.38905609…,−7.38905609…
Therefore, the value of t from the given derivative is 7.38.... or −7.38....
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What is the factored form of 16x2 16x^2 - 16x - 12?
The factored form of the given expression is (8x + 4)(2x - 3).
What do we mean by factor form?Modified form (of a quadratic expression) It is referred to as being in factored form when a quadratic expression is represented as the sum of two linear factors plus a constant.Y=1/2(x-6)(x+2) is an illustration of a quadratic function in factored form. This shape can be examined to determine the vertex as well as the graph's x-intercepts.So, the expression is:
16x² - 16x - 12Now, evaluate to get the factors as follows:
16x² - 16x - 1216x² -x( 24 - 8 ) - 1216x² -24x + 8x - 128x(2x - 3) + 4(2x - 3)Factors: (8x + 4)(2x - 3)
Therefore, the factored form of the given expression is (8x + 4)(2x - 3).
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What are AB and BC? AC=28 A=30 C=90 B=60
For the given triangle ABC, Measures of given angles are m∠A=30 , m∠C=90 , m∠B=60 and side AC = 28 then the measure of side AB = 56√3/3 , BC =28√3/3.
As given in the question,
In the triangle ABC,
Measures of given angles are :
m∠A=30 , m∠C=90 , m∠B=60
And Measure of side AC = 28
As ABC is right angled triangle with m∠C=90,
If we take ∠A,
AC = Base
AB = Hypotenuse
BC = perpendicular side
Using trigonometric ratios,
tan A = BC/AC
⇒tan 30° = BC / 28
⇒1/√3 = BC /28
⇒ BC = 28/√3
⇒BC = 28√3/3
Now,
cos A = AC/AB
⇒ cos 30° = 28/AB
⇒ √3/2 = 28 /AB
⇒ AB = (28 × 2)/√3
⇒ AB = 56√3/3
Therefore, for the given triangle ABC, Measures of given angles are m∠A=30 , m∠C=90 , m∠B=60 and side AC = 28 then the measure of side AB = 56√3/3 , BC =28√3/3.
The complete question is:
What are AB and BC? AC=28 , m∠A=30 , m∠C=90 , m∠B=60.
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A determined gardener has 110 ft of deer-resistant fence. She wants to enclose a rectangular vegetable garden in her backyard, and she wants the area that is enclosed to be at least 684 square feet. What range of values is possible for the length of her garden?
The range of values possible for the length of her garden is 19 ≤ length ≤ 36 .
In the question ,
it is given that ,
the length of the deer resistant fence = 110 ft
let the width of the garden be "x" ,
and let the length of the garden be "y" .
So , the equation representing the perimeter of the rectangular garden is
2(x + y) = 110
y = 55 - x
and the equation representing the area of the rectangular garden is
xy = 684
Substituting the value of y = 55 - x in xy = 684 ,
we get ,
x*(55 - x) = 684
55x - x² = 684
x² - 55x + 684 = 0
x² - 36x - 19x + 684 = 0
x(x - 36) -19(x - 36) = 0
(x - 19)(x - 36) = 0
x = 19 OR x = 36 .
Substituting the values of x= 19 we get
the length (y) = 55 - 19 = 36
putting the values of x = 36 , we get
the length (y) = 55 - 36 = 19 .
So , we get the range of length as 19 ≤ y ≤ 36 .
Therefore , The range of values possible for the length of her garden is 19 ≤ length ≤ 36 .
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. Mr. Witte is ordering trophies for his school. Company P charges $3.50 for each
trophy and a one-time engraving fee of 25$. Company R charges $7.50 for each
trophy and a one-time engraving fee of 17$. Which inequality can be used to find x,
the minimum number of trophies that can be ordered so that the total charge at
Company P is less than the total charge at Company R?
K
The minimum number of trophies that can be ordered so that the total charge at Company P is less than the total charge at Company R is 3
Company P charges $3.50 for each trophy and a one-time engraving fee of 25$
Let the number of trophies he buys be x
Total price at company P = 3.50x + 25
Company R charges $7.50 for each trophy and a one-time engraving fee of 17$.
Total price at company R = 7.50x + 17
minimum number of trophies that can be ordered so that the total charge at Company P is less than the total charge at Company R
3.50x + 25 < 7.50x + 17
- 4x < -8
4x > 8
x > 2
Therefore, minimum number of trophies that can be ordered so that the total charge at Company P is less than the total charge at Company R is 3
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Move the dot to -8 on the number line.
Answer:
(-10) ' (-8) ' | ' | ' | ' (0) ' | ' | ' | ' | ' (10)
A sinking fund is established to discharge a debt of $80,000 in 5 years. If deposits are made at the end of each 6-month period and interest is paid at the rate of 2%, compounded semiannually, what is the amount of each deposit?
(Round your answer to the nearest cent.)
If interest is paid at the rate of 2%, compounded semiannually, the amount of each deposit is $7,306.27.
How to find the amount of each deposit?Payment amount =x
Future value =80000
Periodic interest: 2% = .02
Number of periods: 5×2 = 10
Hence,
80,000=x [ (1+0.02)^10 -1 ) ÷ 0.02]
80,000=x [ (1.02)^10 -1) ÷ 0.02]
80,000=x [ (1.21899 -1) ÷ 0.02]
80,000=x (0.21899 ÷ 0.02)
80,000= x(10.9495)
x =80,000 /10.9495
x = $7,306.27
Therefore payment amount is $7,306.27.
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PLEASE HELP EXPLAIN!!!
Answer: 1/60
Step-by-step explanation:
1/4 times1/4 times 1/4 eqauls 1/60
The function f(x)=90e−0.3x+10 describes the percentage of information, f(x), that a particular person remembers x weeks after learning the information.
a.
Substitute 0 for x and, without using a calculator, find the percentage of information remembered at the moment it is first learned.
b.
Substitute 1 for x and find the percentage of information that is remembered after 1 week.
c.
Find the percentage of information that is remembered after 12 weeks.
d.
Find the percentage of information that is remembered after one year (52 weeks).
(a) The information remembered by the person in starting is 100%.
(b) The information remembered by the person after 1 week is 66.67%.
(c) The information remembered by the person after 12 weeks is 12.46%.
(d) The information remembered by the person after 52 weeks is 10%
What is an equation?An equation is a combination of different variables, in which two mathematical expressions are equal to each other.
The given function is,
f(x) = [tex]90e^{-0.3x}+10[/tex] (1)
(a)
Substitute x=0 in the equation (1)
f(0) = 90 e⁰ +10
Since, e⁰ = 1
f(0) = 90 +10
f(0) = 100
The information remembered by the person is 100.
(b)
Substitute x=1 in the equation (1)
f(1) = 90 [tex]e^{-0.3}[/tex] +10
f(1) = 66.67 + 10
f(1) = 76.67
The information remembered by the person is 66.67%.
(c)
Substitute x=12 in the equation (1)
f(12) = 90[tex]e^{-3.6}[/tex] +10
f(12) = 2.46 + 10
f(12) = 12.46
The information remembered by the person is 12.46%.
(d)
Substitute x=52 in the equation (1)
f(52) = 90[tex]e^{-15.6}[/tex] +10
f(52) = 0.00015 + 10
f(52) = 10(approx)
The information remembered by the person is 10%.
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Draw a graph of the line Y=3X
Please help
Answer:
Take a look at the attachment...
Hope this helps! :)
Graph the equation shown below by transforming the given graph of the parent function
Y=4*2^-x + 1
The graph of the parent function Y = 2²⁻ ˣ +1 is presented below.
What is parent function?The parent function of a function is the simplest form of the function, which satisfies all the conditions of the given function.
The given function is,
Y= 4×2⁻ˣ+1
To find the parent function, simplify the given function,
Y = 2²ˣ2⁻ˣ+1
Y = 2²⁻ ˣ +1
Function Y = 2²⁻ ˣ +1 is the parent form of the given function Y= 4×2⁻ˣ+1.
The graph of the Y = 2²⁻ ˣ +1 is presented below.
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In the following equation: 4x -3=8, x represents a variable
Answer:
x = 11/4Step-by-step explanation:
In the following equation: 4x -3=8, x represents a variable
assuming you are looking for the value of x
4x - 3 = 8
4x = 11
x = 11/4
-------------
check
4 x 11/4 - 3 = 8
11 - 3 = 8
8 = 8
the answer is good
A binomial experiment has the given number of trials n and the given success probability p.
n=20, p=0.7
find p(8)
The value of P(8)=0.0039
What is binomial distribution?
The binomial distribution gives out either success or failure as two possible results in an experiment, is the discrete probability distribution used in probability theory and statistics.
In binomial terms, what is PMF?
Since the 17th century, researchers have focused on the binomial probability mass function, a discrete probability mass function that is particularly popular. It applies to numerous experiments with two possible results, such as the heads-or-tails coin toss or the decay-or-no decay radioactive nucleus experiment.
let x ~ Binomial(n=20, p=0.7)
Use following binomial p.m.f:
[tex]P(x)=^{n}C_{x}p^{x}(1-p)^{n-x}[/tex]
[tex]P(x=8)=^{20}C_{8}(0.7)^{8}(0.3)^{20-8}[/tex]
P(x=8)=0.0039
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Car inspection: Of all the registered automobiles in Colorado, 5% fail the state emissions test. Twelve automobiles are selected at random to undergo an emissions test. Round the answers to at least four decimal places.
The probability that exactly 3 automobiles fail the test is 0.01733.
The probability that fewer than 3 of the automobiles fail the test is
0.9803.
Complete question:
Car inspection of all the registered automobiles in Colorado, 5% fail the state emissions test. Twelve Automobiles are selected at random to undergo an emissions test. Round the answers to at least four decimal places
(a) Find the probability that exactly three of them fail the test.
(b) Find the probability that fewer than three of them fail the test.
What is Binomial Distribution?
The probability of success is said to follow a binomial distribution when many similar and independent Bernoulli trials are conducted. The likelihood of success and the quantity of tries are its dimensions. For every trial, the chance of success is the same.
State emission test failure probability is 0.05.
12 vehicles total are present.
Let's look at failing the test as a victory. If success is represented by p, then p = 0.05.
Considering that n represents the number of cars, n equals 12.
Let X represent how many vehicles fail the test.
So, X ∼ Bin (8,0.05)
P(X=x)= [tex]^{n}C_{x}p^{x}(1-p)^{n-x}[/tex]
= [tex]^{12}C_{x}0.05^{x}(0.95)^{12-x}[/tex]
a) Probability that exactly 3 automobiles fail the test is given by,
P(X=3)= [tex]^{12}C_{3}0.05^{3}(0.95)^{12-3}[/tex]
=0.01733
So, the probability that exactly 3 automobiles fail the test is 0.01733.
b) Probability that fewer of them than 3 fail the test is given by,
P(X<3)= P(X≤2)
= P(X=0)+P(X=1)+P(X=2)
= [tex]^{12}C_{0}(0.05)^{0}(0.95)^{12}[/tex] + [tex]^{12}C_{1}(0.05)^{1}(0.95)^{11}[/tex]+[tex]^{12}C_{2}(0.05)^{2}(0.95)^{10}[/tex]
= 0.9803
Hence, the probability that fewer than 3 of the automobiles fail the test is
0.9803.
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f(x) =(x-3)^2 +1 to g(x) =(x^2 -4)
For each part, state all of the transformations taking place. Use precise
language! Sketch a graph
a. The two transformations we perform are
shifting f(x) three units to the left andshifting f(x) five units downb. Find the graph in the attachment
What are transformations?Transformations are mathematical operation sthat are performed to change the shape or orientation of a function or object.
a. How to perform the transformation?Since we require to transform the function f(x) = (x-3)² + 1 to g(x) = (x² -4), we perform the following transformation operations.
In f(x), first we shift the term (x - 3)² three units to the left. So, (x - 3 + 3)² = x²
So, f(x) = x² + 1
To transform f(x) = x² + 1 to g(x) = (x² - 4), we shift f(x) five units down.
So, the transformation is f(x) = x² + 1
= x² + 1 - 5
= x² - 4
So, the two transformations we perform are
shifting f(x) three units to the left andshifting f(x) five units downb. Sketch a graphFind the graph in the attachment
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You have a goal of saving to build up a nest egg of $625,357.24, and you are going to make regular deposits to an account that pays an APR of 7.2% compounded monthly. What monthly deposits are required to reach this goal in 40 years? (Round your answer to the nearest cent.)
The monthly deposit required to save up to $625,357.24 (future value) in 40 years at a 7.2% APR is $225.20.
What is the monthly deposit?The monthly deposits are the periodic savings that the investor must make to achieve future value.
The monthly deposit is compounded at the monthly annual percentage rate (APR).
We can compute the required monthly deposits using an online finance calculator as follows:
N (# of periods) = 480 months (40 years x 12)
I/Y (Interest per year) = 7.2%
PV (Present Value) = $0
FV (Future Value) = $625,357.24
Results:
Monthly Deposits (PMT) = $225.20
Sum of all periodic payments = $108,096 ($225.20 x 480)
Total Interest = $517,261.24
Thus, to save $625,357.24 in 40 years, you need to deposit $225.20 monthly.
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Metabolic rate, the rate at which the body consumes energy, is important in studies of weight gain, dieting, and exercise. We
lishers
have data on the lean body mass and resting metabolic rate for 12 women who are subjects in a study of dieting. Lean body
Publi
mass, given in kilograms, is a person's weight leaving out all fat. Metabolic rate is measured in calories burned per 24 hours.
The researchers believe that lean body mass is an important influence on metabolic rate. Given is the scatterplot of body mass
BFW
versus metabolic rate.
The value of mean is 158 and the value of standard deviation is 190.99
How to estimate mean and standard deviation?Let m be mean
Mean= sum/ n
Mean= (1730+1689+1326+1614+1460+1867+1430) / 7
m= 11116 / 7
M= 1588
Mean= 158
Standard deviation sample formula is :
S.D=sqrt((|x-m|^2)/ n-1)
So let start find |x-m|^2
For 1st: |1730-1588|^2=20164
For 2nd: |1689-1588|^2=10201
For 3rd: |1326-1588|^2=68644
For 4th: |1614-1588|^2=676
For 5th: |1460-1588|^2=16384
For 6th: |1867-1588|^2=77841
For 7th: |1430-1588|^2=24964
Summation of |x-m|^2 = 218874
Standard deviation formula is:
S.D = sqrt((summation of |x-m|^2) / n-1)
S.D=sqrt(218874/6)
S.D=sqrt(36479)
S.D=190.99
Therefore the mean and standard deviation is 1588 and 190.99
The complete question is : A person's metabolic rate is the rate at which the body consumes energy. Metabolic rate is important in studies of weight gain, dieting, and exercise. Here are the metabolic rates of 7 men who took part in a study of dieting. (The units are calories per 24 hours. These are the same calories used to describe the energy content of foods.) 1730 1689 1326 1614 1460 1867 1430 Calculate the mean and standard deviation of the metabolic rates, showing each step in detail.
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A bag contains four 1-dollar bills, five 5-dollar bills, and two 10-dollar bills. An experiment consists of drawing three random bills from the bag simultaneously. Considering an outcome to be the three selected bills, the experiment has C(11,3)=165 equally likely outcomes in its sample space. Let E be the event that at least two 5-dollar bills were drawn.
What is n(E)?
The number of elements of event E n(E) is 70.
The selecting of r items out of n items is done by using Combination. The formula for combination is as follows,
[tex]C(n,r)=\frac{n!}{r!(n-r)!}[/tex]
Where n is the total number of elements and out of which r is selected and ! is factorial sign and n is greater than or equal to r.
Now, Finding the number of elements in the event E that at least two 5-dollar bills are drawn from the bag.
Here, three bills are drawn out of which at least two 5-dollar bills must be drawn, so
[tex]n(E)=C(5,2)\times C(6,1)+C(5,3)\\\\=\frac{5!}{2!(5-2)!} \times \frac{6!}{1!(6-1)!} +\frac{5!}{3!(5-3)!}\\\\=10\times6+10\\=70[/tex]
Therefore, the number of elements n(E) in event E is 70.
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Please help ( image attached )
The scale Alexander is using for his map is 1 inch : 300 feet
The height of Alexander's triangle in inches is 4 inches
How to find the scale of the mapThe scale of the map is gotten by comparing the first dimensions Alexander drew
He made 10 inches to represent 3000 feet, this is equivalent to 1 inch to 300 feet hence the scale is 1 inch : 300 feet
Using the scale, a height of 1200 feet would be
1 inch = 300 feet
? inch = 1200 feet
cross multiplying
? * 300 = 1200 * 1
? = 1200 / 300
? = 4 inches
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11/3x7/3x5/3 What is the answer wwwwwwwwwwwww
The answer of 11/3*7/3*5/3 after multiplication is 385/27.
According to the question,
We have the following expression:
11/3*7/3*5/3
We know that when we multiply two more than two fractions then numerator is multiplied into the numerator and the denominator is multiplied into the denominator of another fraction.
So, we have the following expression after multiplying first two fractions:
77/9*5/3
Now, again repeating the above step:
385/27
(This can not be further classified into the simplest form because the numerator and denominator of this fraction can not be divided by one number.)
Hence, the answer of 11/3*7/3*5/3 after multiplication is 385/27.
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Name
(Score for Question 2:
of 4 points)
2. Jaxon bought a cell phone. The cell phone's down payment is $35. There is a monthly cost of $20.
A. Write an equation that gives the total cost (in dollars) of paying a down payment for a cell
phone and paying a monthly payment as a function of the number of months needed to pay
off the phone in full. Write the equation in slope-intercept form.
-
Date
y=mx+b
Math 4.10 | Unit 4 Test, Part 2 | Lines | Page 2 of 4
B. Find the total cost if it takes 10 months to pay off the cell phone in full. Show your work.
Answer:
Y= 20x + 35
Step-by-step explanation: I have the same test.
Find each measure.
QP =
NQ=
OR=
QO =
RP =
NP =
N
X
13 m
R
19 m
P
12 m
The measures are:
QP = 19NQ= 12OR= 6.5QO = 13RP = 6.5NP = 13What is parallelogram?A unique variety of quadrilateral made up of parallel lines is called a parallelogram.A parallelogram can have any angle between its neighboring sides, but it must have opposite sides that are parallel for it to be a parallelogram.If the opposite sides of a quadrilateral are parallel and congruent, it will be a parallelogram.Consequently, a quadrilateral in which both pairs of opposite sides are parallel and equal is referred to as a parallelogram.We can identify and distinguish a parallelogram with the help of the following properties:The opposites sides of a parallelogram are parallel. Here, PQ ‖ RT and PR ‖ QT.
The opposite sides of a parallelogram are equal. Here, PQ = RT and PR = QT
The opposite angles of a parallelogram are equal. Here, ∠P = ∠T and ∠Q = ∠R
The diagonals of a parallelogram bisect each other. Here, RE = EQ and PE = ET
Same-side interior angles supplement each other. Here, ∠PRT + ∠RTQ = 180°, ∠RTQ + ∠TQP = 180°∘, ∠TQP + ∠QPR = 180°, ∠QPR + ∠PRT = 180°
The diagonals divide the parallelogram into two congruent triangles. Here, ΔRPQ is congruent to ΔQTR, and ΔRPT is congruent to ΔQTP
Therefore,
QP = 19NQ= 12OR= 6.5QO = 13RP = 6.5NP = 13To learn more about parallelogram, refer to
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.....................
.
me too. did you know that animals that lay eggs don't have belly buttons?
{Question 12} Please help! Need this by tonight! Thanks so much {Click on picture}
A busy international airport has 40920 take offs and landings in the month of March and each day has same number of take offs and landings. How many landing and take offs would be there in a single day?
Answer:
0.00075757575.
Step-by-step explanation:
I looked it up.
The five types of positive résumé misrepresentations are false credentials, false experience, false chronology, embellished experience, false references. Negative résumé misrepresentations have also been discussed. Looking back at Irvine’s résumé adventure, can you label each of his transgressions?
False Credentials: The "grant" was a fake certification rather than something that was given to Irvine.
False Experience: He was serving the president food. The fact that he was simply a line, however, was revealed
False chronology: Five Star Diamon Award for a couple of back-to-back years. However, it was found that it was not consecutive.
Embellished experience: it was discovered that he had only chosen particular organic ingredients for the cake, didn't handle it
False References: The queen of England personally selected him for knighthood, which was inaccurate since it will never happen.
What is a resume?
A resume is a formal record that a candidate for a job makes to list their qualifications for the position. A personalized cover letter is typically included with a resume, in which the candidate expresses interest in a particular position or business and highlights the key information on the CV.
False Credentials: Robert Irvine misrepresented his education and experience by claiming on his résumé that he had completed a four-year program at the University of Leeds to earn a degree in food and nutrition. The college claimed they were unable to find any concrete connections between Irvine and the college in their records. Additionally, Irvine had to pay to participate in order to receive the "gift," making the American Academy of Hospitality Sciences anything but a licensed group. In this way, the "grant" was a fake certification rather than something that was given to Irvine.
False Experience: Irvine claimed to be a gourmet chef for the White House and implied that he was serving the president food. The fact that he was simply a line, however, was revealed
False chronology: According to Irvine, the American Academy of Hospitality Sciences gave him the Five Star Diamon Award for a couple of back-to-back years. However, it was found that it was not consecutive.
Embellished experience:He claimed on his resume that he had handled the wedding cake for Prince Charles and Princess Diana, although this was an inflated experience. Nevertheless, it was discovered that he had only chosen particular organic ingredients for the cake.
False References: Finally, he claimed that the Queen of England personally selected him for knighthood, which was inaccurate since it will never happen.
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The test Score of a Math class with 800 students are distributed
normally with a mean of 75 and a standard deviation of 7.
a) What percentage of a class has a test score between 68 and 82?
b) Approximately how many students have a test score between 61
and 89?
c) What is the probability that a student chosen at random has a
test score between 54 and 75?
d) Approximately how many students have a test score greater
than or equal to 96?
Answer:
(a) 68.3%
(b) 764 students
(c) 49.87%
(d) 1 student
Step-by-step explanation:
You want to know various percentages and numbers of students in different test score ranges when 800 students have scores normally distributed with a mean of 75 and a standard deviation of 7.
a) [68, 82]The range 68 to 82 is one standard deviation either side of the mean: 75±7. The "empirical rule" tells you about 68% of students will have a test score in this range. An appropriate calculator gives the fraction as 68.3%.
b) [61, 89]The range 61 to 89 is 2 standard deviations either side of the mean: 75±2·7. The "empirical rule" tells you about 95% of the 800 students will have a test score in this range. An appropriate calculator puts the number slightly higher than 760 students: 764 students.
c) [54, 75]The range 54 to 75 is 3 standard deviations below the mean. The empirical rule tells you about 99.7% of the group falls inside 3 standard deviations. Half this number is below the mean, about 49.85% An appropriate calculator puts the number slightly higher: 49.87%.
d) [96, ∞)The scores at 96 and above are more than 3 standard deviations above the mean. As in part (c), the number in that tail are given by the empirical rule as about 0.15%, or 1.2 students. An appropriate calculator puts the number in the tail of the distribution at a slightly lower value. Hence, the estimated number of students with a score at least 96 is 1 student.
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Additional comment
The numbers in this question seem to be chosen so you can use the empirical rule to find the answers. That rule will make the answers slightly different: 68%, 760 students, 49.85%, 1 student.
a) The percentage of a class has a test score between 68 and 82 is; 68.269%
b) The number of students that will score between 61 and 89 is; 764 students
c) The probability that a student chosen at random has a test score between 54 and 75 is; 0.49865
d) The number of students that have a test score greater than or equal to 96 is; 1
How to solve normal distribution problems?We are given;
Mean; μ = 75
Standard deviation; σ = 7 ;
a) We have to find percentage of a class has a test score between 68 and 82. This is expressed as; P(68 < X < 82)
P(68 < X < 82) = P(X < 82) - P(X < 68)
The formula for z-score is;
z = (x' - μ)/(σ)
Thus;
P(68 < X < 82) = P(Z < (82 - 75)/7) - P(Z < (68 - 75/7)
P(-1<x<1) = 0.68269 = 68.269%
b) The number of students that will score between 61 and 89 is;
P(61 < X < 89)
z -scores;
z = (61 - 75)/7
z = -2
z = (89 - 75)/7
z = 2
p-value between the two z-scores from online calculator is;
p = 0.9545
Number of students here = 0.9545 * 800 ≈ 764 students
c) The probability that a student chosen at random has a test score between 54 and 75;
P(54 < X < 75)
z -scores;
z = (54 - 75)/7
z = 3
z = (75 - 75)/7
z = 0
p-value between the two z-scores from online calculator is;
p = 0.49865
d) We want to find out how many students have a test score greater
than or equal to 96.
z = (96 - 75)/7
z = 3
p-value from z-score calculator gives;
p = 0.00135
Thus;
Number of students in this regards = 0.00135 * 800 ≈ 1
Read more about normal distribution at; https://brainly.com/question/4079902
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IXL Help Fast Please !
Answer:
y=-2x
Step-by-step explanation:
2=-2(-1)
2=2
Sorry for late response
solve the system by using the substitution method. x=2y-3, -4x+3y=2
Answer:
(x, y) = (1, 2)
Step-by-step explanation:
You want to solve the system of equations x=2y-3, -4x+3y=2 using the substitution method.
SubstitutionThe first equation gives you an expression for x that can be substituted into the second equation.
-4(2y-3) +3y = 2 . . . . . . substitute (2y-3) for x
-8y +12 +3y = 2 . . . . . simplify
10 = 5y . . . . . . . . . . add 5y -2 to both sides
2 = y . . . . . . . . . . divide by 5
Now, the value of x can be found from the first equation:
x = 2(2)-3 = 1
The solution is (x, y) = (1, 2).
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Additional comment
The advantage of the substitution method is that once you find the value of the remaining variable, you can use the substitution equation to find the value of the variable that was eliminated. That is, the equation for x made it easy to find x once we solved for y.
Substitution is easiest when there is already an equation for one of the variables. It can also be used fairly easily if one of the variables has a coefficient of 1 or -1.