pls step by step so i can understand it​

A) The probability of a z-score of 0.5909 or higher is 0.0808.

B) The probability of a three-year return of 10% or less is 0.3413.

C) A return of at least 18.91% would put a domestic stock fund in the top 15% for the three-year period.

(a) The probability that an individual large-cap domestic stock fund had a three-year return of at least 17% is 0.0808.

To calculate this probability, we can use the z-score formula:

z = (x - μ) / σ

Where:

x = 17%

μ = 14.4%

σ = 4.4%

z = (17% - 14.4%) / 4.4% = 0.5909

Using a standard normal distribution table or calculator, we can find that the probability of a z-score of 0.5909 or higher is 0.0808.

(b) The probability that an individual large-cap domestic stock fund had a three-year return of 10% or less is 0.1151.

Using the same formula and substituting x = 10%, we get:

z = (10% - 14.4%) / 4.4% = -1.0000

The probability of a z-score of -1.0000 or lower is 0.1587. However, we want the probability of a return of 10% or less, so we need to subtract this probability from 0.5 (since the normal distribution is symmetric around 0) and round to four decimal places:

P(z ≤ -1.0000) = 0.1587

P(z ≥ 1.0000) = 0.1587

P(z ≤ -1.0000) + P(z ≥ 1.0000) = 0.3174

1 - 0.3174 = 0.6826

0.6826 / 2 = 0.3413

So, the probability of a three-year return of 10% or less is 0.3413.

(c) To be in the top 15% of large-cap domestic stock funds for the three-year period, a fund's return would need to be at least 18.91%.

To find this value, we need to find the z-score that corresponds to the top 15% of the distribution, which is 1.0364 (found using a standard normal distribution table or calculator). Then, we can use the z-score formula to solve for x:

1.0364 = (x - 14.4%) / 4.4%

x - 14.4% = 1.0364 * 4.4%

x = 18.91%

Therefore, a return of at least 18.91% would put a domestic stock fund in the top 15% for the three-year period.

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The responses that must be included are the population is all high school students, the sample contains freshmen, sophomores, juniors, and seniors, and the sample is representative of students in the entire high school.

Hence, options A, B, and D are correct.

To ensure that a sample is representative of the population, it must be selected in a way that accurately reflects the characteristics of the population. In this case, the population is all high school students in the town, and the possible sample includes an equal number of students from each grade level - freshman, sophomores, juniors, and seniors.

This is a good approach to ensure that the sample is representative of the entire population, as it captures the diversity of the population by including students from each grade level. Additionally, by having an equal number of students from each grade level, the sample is not biased towards any particular group.

It is also important to ensure that the sample is not too small, as a small sample size may not accurately reflect the characteristics of the entire population. Finally, if the sample is truly representative of the entire high school, any conclusions drawn from the sample should be applicable to the population as a whole.

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Answer:

9/10 or 0.9

Step-by-step explanation:

Slope of a line passing through two points (x1, y1) and (x2, y2) is given by
Slope m = rise/run

where
rise = y2 - y1
run = x2 - x1

Given points (- 6, - 5) and (4, 4),

rise = 4 - (-5) = 4 + 5 = 9

run = 4 - ( - 6) = 4 + 6 = 10

Slope = rise/run = 9/10 or 0.9

Answer:

  r√2

Step-by-step explanation:

You want to know the distance from the center of a marble of radius r to the corner of an L-shaped track in which it rolls.

The center of the marble can only come within r of the track edges, so the distance to the corner will be the hypotenuse of a right triangle with legs r. That distance is r√2.

The center of the marble is r√2 from the corner of the track.

__

Additional comment

You can see in the second attachment that the distance to the corner of the track will depend on where the marble is rolling in the track. It might only be r away from the corner.

<95141404393>

Answer: 121/209= 57.89% rounded

Step-by-step explanation:

total golf balls are 209

add red +  yellow balls = 121

121/209= 57.89% rounded

The reasonable way to test this one is to identify the validity of the hypothesis can be tested.

The hypothesis suggests that when an electric current passes through a wire, it generates a magnetic field. If this magnetic field is strong enough, it could magnetize a non-magnetic nail that is placed nearby. To test this hypothesis, an experiment can be conducted as follows:

A non-magnetic nail, a battery, a wire, and a switch.

Connect the wire to the battery and switch in series. The other end of the wire should be wrapped around the nail multiple times. Once the apparatus is set up, turn on the switch to pass an electric current through the wire.

Before running the current through the wire, test the nail for its magnetic properties by holding it close to some iron filings or other small magnetic objects. If it does not attract any of these objects, then it is non-magnetic.

Turn on the switch and run the electric current through the wire wrapped around the nail for a few minutes.

After running the current through the wire, test the nail again for its magnetic properties. Hold it close to the iron filings or other small magnetic objects and observe if it attracts them.

Compare the results obtained before and after running the current through the wire. If the nail exhibits magnetic properties after running the current, then the hypothesis that passing an electric current through a wire can magnetize a non-magnetic nail can be considered valid.

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Note that the right triangle's area is 750 units². Here is how to get this.

A right triangle or right-angled triangle, or more technically an orthogonal triangle, formerly known as a rectangle triangle, is a triangle with one right angle, i.e. two perpendicular sides.

Trigonometry is founded on the relationship between the sides and other angles of a right triangle.

So since this triangle is a multiple of a 5-12-13 triangle

Its sides are    25 - 60 - 65( summing this will give 150.)

Its area is  (1/2) * product of the legs  =  (1/2)(25)(60)  =  750 units²

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Answer:

The quadratic equation with roots -3 and -6 and leading coefficient 2 is:

2x2 - 8x - 12 = 0

To derive this, we use the quadratic formula:

ax2 + bx + c = 0

With:

a = 2 (leading coefficient)

b = -4 (calculated from roots: b = -2(root1 + root2) = -2(-3 - 6) = -4)

c = -12 (calculated from discriminant: c = b2/4a = -42/8 = -12)

So the full equation is:

2x2 - 4x - 12 = 0

Which simplifies to:

2x2 - 8x - 12 = 0

This has the roots -3 and -6 as requested, with a leading coefficient of 2.

Step-by-step explanation:

, the probability of one person randomly picking a cherry popsicle and another person selecting a grape popsicle from the box is 1/15.

The probability of one person randomly picking a cherry popsicle is 4/16 (since there are 4 cherry popsicles out of a total of 16 popsicles in the box), and the probability of another person selecting a grape popsicle from the remaining popsicles is 4/15 (since there are only 4 grape popsicles left out of 15 popsicles after one cherry popsicle has been selected).

The probability of an event is calculated by dividing the number of favorable outcomes by the total number of possible outcomes. In this case, the probability of one person randomly picking a cherry popsicle is 4/16 because there are 4 cherry popsicles in the box out of a total of 16 popsicles. After one cherry popsicle has been selected, there are only 15 popsicles left in the box, of which 4 are grape popsicles. Therefore, the probability of another person selecting a grape popsicle from the remaining popsicles is 4/15.

To find the overall probability of both events happening (one person picking a cherry popsicle and another person picking a grape popsicle), we multiply the two probabilities together:

(4/16) x (4/15) = 1/15

Therefore, the probability of one person randomly picking a cherry popsicle and another person selecting a grape popsicle from the box is 1/15.

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The value of cos⁻¹(−0.53) is approximately equals to  -1.012 radians (rounded to 3 decimal places).

Use the inverse cosine function on a calculator to find the value of cos⁻¹(−0.53),

Evaluate it to at least 3 decimal places, use the following steps,

cos⁻¹(−0.53) = x

⇒cos(x) = −0.53

Use the identity cos²(x) + sin²(x) = 1 to solve for sin(x),

⇒sin²(x) = 1 − cos²(x)

⇒sin²(x) = 1 − (−0.53)²

⇒sin²(x) = 0.7191

⇒ sin(x) ≈ ±0.8479

Both a positive and negative value for sin(x),

since sine is positive in both the first and second quadrants.

To determine which value of sin(x) is correct,

The range of values for the inverse cosine function.

The range of cos⁻¹(x) is [0, π], or [0°, 180°],

⇒ The output of the inverse cosine function is always a non-negative angle in the first or second quadrant.

Since sin(x) is negative in the second quadrant, eliminate the positive value for sin(x).

⇒ sin(x) = −0.8479

Now use the inverse sine function to find x,

⇒sin⁻¹(−0.8479) = x

⇒x ≈  -1.012radians

Therefore, cos⁻¹(−0.53) ≈  -1.012 radians (rounded to 3 decimal places).

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The above question is incomplete, the complete question is:

Use your calculator to evaluate cos⁻¹( − 0. 53 ) to at least 3 decimal places. Give the answer in radians

A z-score of -1.32 indicates that Tim's score on the test is below average, but not extremely unusual or unexpected.

If Tim's calculated z-score for his test score of 72 is -1.32, it means that his score is 1.32 standard deviations below the mean of the distribution.

A z-score represents the number of standard deviations that a data point is away from the mean of the data set.

A negative z-score means that the data point is below the mean, while a positive z-score means that the data point is above the mean.

To calculate Tim's score, we can use the formula:

z = (x - μ) / σ

where:

z = the z-score

x = the test score

μ = the mean of the distribution

σ = the standard deviation of the distribution

Substituting the given values, we get:

-1.32 = (72 - μ) / σ

To solve for μ, we need to rearrange the equation as:

μ = 72 - (-1.32) × σ

This means that if Tim's z-score is -1.32 and his test score is 72, then the mean score.

The distribution is 1.32 standard deviations above his score.

The mean score using the standard deviation of the distribution, but we would need additional information such as the standard deviation value.

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a) For a one-tail test with Zx = 1.46 and a = 0.10, the area in the tail to the right of 1.46 is 0.0735. Since this is greater than 0.10, we fail to reject the null hypothesis.

b) For a one-tail test with Zx = -2.48 and a = 0.01, the area in the tail to the left of -2.48 is 0.0066. Since this is less than 0.01, we reject the null hypothesis.

c) For a two-tail test with Zx = -1.92 and a = 0.01, the area in each tail is 0.025. The total area in the tails is 0.050. Since this is greater than 0.01, we fail to reject the null hypothesis.

d) For a two-tail test with Zx = 2.76 and a = 0.02, the area in each tail is 0.01. The total area in the tails is 0.02. Since this is less than 0.02, we reject the null hypothesis.

Followings are the answers of 9.3 :

a) Since the test is for the alternative hypothesis that ? > 50, and the sample mean is 52, which is greater than 50, we reject the null hypothesis.

b) The test statistic is Z = (52 - 50) / (12 / sqrt(36)) = 1.5. The area in the tail to the right of 1.5 is 0.0668. Therefore, the p-value for the test is 0.0668.

Followings are the answers of 9.4 :

a) Since the test is for the alternative hypothesis that ? < 120, and the sample mean is 111, which is less than 120, we reject the null hypothesis.

b) The test statistic is Z = (111 - 120) / (26 / sqrt(40)) = -2.3038. The area in the tail to the left of -2.3038 is 0.0104. Therefore, the p-value for the test is 0.0104.

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[tex]ANSWER \\ (( \frac{1}{3} ) {}^{4} ) {}^{ \frac{1}{2} } \\ [/tex]

simplify the expression

[tex]( \frac{1}{3} ) {}^{ \frac{4}{1} \times } {}^{ \frac{1}{2} } \\ ( \frac{1}{3} ) {}^{ \frac{4}{2} } \\ ( \frac{1}{3} ) {}^{2} \\ = \frac{1}{9} [/tex]

~hope it helps~

have a nice day (✿^‿^)

First, we need to calculate what's inside the parentheses of the exponent.

1/3^4 = 1/81

Now, we can simplify the exponent:

(1/81)^1/2 = 1/9

Therefore, (1/3^4)^1/2 = 1/9. <⁠(⁠￣⁠︶⁠￣⁠)⁠>

The answer is option A. increasing the sample size.

The central limit theorem (CLT) is a statistical theory that explains the behavior of sample means when drawn from a population with any distribution, as long as the sample size is large enough. The CLT states that as the sample size increases, the sampling distribution of the means approaches a normal distribution, regardless of the shape of the original population distribution.

One implication of the CLT is that increasing the sample size makes the sampling distribution more precise and reliable, as the standard error of the mean decreases with larger samples. However, the CLT does not necessarily imply that increasing the sample size decreases the dispersion (or variability) of the sampling distribution itself.

The dispersion of the sampling distribution is determined by the variability of the original population and the sample size, but it does not change with sample size alone. For example, if the original population has a large standard deviation, the sampling distribution of the means will also have a large standard deviation, even with a large sample size. However, as the sample size increases, the means will be more tightly clustered around the population mean, which means that the precision of our estimate of the population mean increases.

Therefore, the answer is option A. increasing the sample size.

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Answer:

reflectional symmetry

Step-by-step explanation:

If 3 men build a garage in 8 days, then 4 men will be needed to build the garage in 6 days.

The amount of work required to build the garage is constant, regardless of the number of days or workers involved. We assume that each worker does the same amount of work in a day, then we use the following formula;

⇒ work = rate × time,

where rate is = amount of work done by one worker in a day, and time is = number of days worked,

Let the number of workers needed be "x". If 3-workers can build the garage in 8 days, then we have:

⇒ work = 3 workers × 8 days = 24 worker-days,

If "x" workers are needed to build the garage in 6 days, then we have:

⇒ work = (x workers) × (6 days),

Since the amount of work is same in both cases, we equate the two expressions;

⇒ 3 workers × 8 days = x workers × 6 days

⇒ x = (3 workers × 8 days)/6 days = 4 workers;

Therefore, 4 workers are needed to build the garage in 6 days.

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The numeral 201 (base three) is equivalent to 19 in base 10.

To understand how to convert the numeral 201 (base three) to base 10, it is helpful to first understand what these two number systems represent.

Base 3 (ternary) is a positional number system that uses three digits: 0, 1, and 2. Each digit represents a different power of 3, with the rightmost digit representing [tex]3^0[/tex], the next digit to the left representing [tex]3^1[/tex], and so on. Therefore, the numeral 201 (base three) can be interpreted as:

[tex]2 * 3^2 + 0 * 3^1 + 1 * 3^0[/tex]

To convert this numeral to base 10 (decimal), we simply evaluate this expression:

[tex]2 * 3^2 = 18[/tex]

[tex]0 * 3^1 = 0[/tex]

[tex]1 * 3^0 = 1[/tex]

Adding these values together, we get:

18 + 0 + 1 = 19

Therefore, the numeral 201 (base three) is equivalent to 19 in base 10.

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The spring constant of the spring is determined as 5,444.4 N/m.

The maximum acceleration of the object in simple harmonic motion is given by:

a = ω²A

where;

The spring constant k is given as;

ω = √(k/m)

ω²m = k

ω² = k/m

a = ω²A

a = (k/m ) A

Where;

k/m = a/A

k = m (a/A)

k = 25 x 9.8 / 0.045

k = 5,444.4 N/m

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If cholesterol level were changed to being measured in grams instead of milligrams, the correlation between fat content and cholesterol level would not be affected.

This is because correlation is a measure of the strength and direction of the linear relationship between two variables, and converting the units of measurement does not change the underlying relationship between the variables. So, the correlation coefficient of 0.75 would remain the same whether cholesterol level is measured in milligrams or grams.

The correlation between fat content and cholesterol level for the 20 different brands of American cheese slices is 0.75. If you change the measurement of cholesterol level from milligrams to grams (1 gram = 1000 milligrams), it will not affect the correlation. The correlation coefficient will remain 0.75, as it is unit-less and only represents the strength and direction of the relationship between the two variables.

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According to the given inductive definition of Ackermann's function, we can find the values of the function as follows:

A(2,1) = A(1, A(2,0)) = A(1, 1) = A(0, A(1,0)) = A(0, 2) = 2

A(1,2) = A(0, A(1,1)) = A(0, A(0, A(1,0))) = A(0, A(0, 2)) = A(0, 4) = 6

A(1,0) = A(0, A(1,-1)) = A(0, A(0, 0)) = A(0, 1) = 2^1 = 2

A(0,1) = 2^1 = 2

A(3,0) = A(2, A(3,-1)) = A(2, A(2, A(3,-2))) = A(2, A(2, A(2, A(3,-3)))) = A(2, A(2, A(2, 1))) = A(2, A(2, 2)) = A(2, 2^2) = A(2, 4) = 2^4 = 16

A(3,3) = A(2, A(3,2)) = A(2, A(2, A(3,1))) = A(2, A(2, A(2, A(3,0)))) = A(2, A(2, A(2, 1))) = A(2, A(2, 2)) = A(2, 2^2) = A(2, 4) = 2^4 = 16

Therefore, the values of Ackermann's function are:

A(2,1) = 2

A(1,2) = 6

A(1,0) = 2

A(0,1) = 2

A(3,0) = 16

A(3,3) = 16
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The probability that you and your friend both have the same two numbers is approximately 0.4823, or about 48.23%.

If you and your friend each roll two dice, there are two possible cases:

You both roll doubles (i.e., both dice show the same number).

You both roll non-doubles (i.e., the two dice show different numbers).

Let's calculate the probability of each case separately:

The probability of rolling doubles on one die is 1/6, since there are six possible outcomes (1, 2, 3, 4, 5, or 6) and only one of them will result in doubles. The probability of rolling doubles on both dice is the product of the probabilities of rolling doubles on each die, which is (1/6) * (1/6) = 1/36. Therefore, the probability that you and your friend both roll doubles is (1/36) * (1/36) = 1/1296.

The probability of rolling non-doubles on one die is 5/6, since there are five possible outcomes (2, 3, 4, 5, or 6) that will result in non-doubles, out of a total of six possible outcomes. The probability of rolling non-doubles on both dice is the product of the probabilities of rolling non-doubles on each die, which is (5/6) * (5/6) = 25/36. Therefore, the probability that you and your friend both roll non-doubles is (25/36) * (25/36) = 625/1296.

Therefore, the overall probability that you and your friend both have the same two numbers is the sum of the probabilities of the two cases:

1/1296 + 625/1296

= 626/1296

= 0.4823 (rounded to four decimal places)

So, the probability that you and your friend both have the same two numbers is approximately 0.4823, or about 48.23%.

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The equation of the circle is given as follows:

x² + y² = 2704.

The equation of a circle of center [tex](x_0, y_0)[/tex] and radius r is given by:

[tex](x - x_0)^2 + (y - y_0)^2 = r^2[/tex]

The center is the position of the transmitter site, hence it is at the origin.

As stated in the problem, the radius of the circle is given as follows:

r = 52 miles.

Hence the equation of the circle is given as follows:

x² + y² = 52²

x² + y² = 2704.

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Julio can complete one math problem in 10/3 = 3.33 minutes.

Therefore, he can complete all 14 math problems in 14 x 3.33 = 46.62 minutes.

So, it took Julio approximately 46.62 minutes to complete his math homework.

To solve this problem, we need to use the concept of rate and time. We are given that Julio can complete 3 math problems in 10 minutes, which means his rate of work is 3/10 = 0.3 math problems per minute. We need to find out how long it would take him to complete 14 math problems, which is simply a matter of multiplying the number of problems by his rate of work. So, 14 x 0.3 = 4.2 math problems per minute.

However, we need to convert this to time, so we take the reciprocal of 0.3 to get 3.33 minutes per math problem. Finally, we multiply this by the total number of problems (14) to get the total time it took Julio to complete his homework, which is approximately 46.62 minutes.

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Based on the given side lengths of 3cm, 7cm, and 7.4cm, the triangle is a(n) scalene triangle. In a scalene triangle, all sides have different lengths.

Triangles are described in terms of their sides and angles in geometry. A closed planar three-sided polygon shape with three sides and three angles is known as a triangle. The lengths of the sides of a scalene triangle vary. They are not equal, and the angles have three measurements. However, it still has a 180° angle sum, just like all triangles.

A scalene triangle is a triangle with three different side lengths and three different angle measurements. The total of all internal angles, however, is always equal to 180 degrees. As a result, it satisfies the triangle's condition of angle sum.

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The proportion of infants with birth weights under 95 oz is about 0.159oz

68−95−99.7 Rule, also known as the empirical rule conveys that for a normal distribution, mostly all of the data will fall within three (68%,95%,99.7%) standard deviations of the mean. Empirical rule is an approximate so it is not recommended to use unless a question specifically asks you to solve using it.

Let X be the Birthweights

X ~ N( = 110, [tex]\sigma^2 = 15^2[/tex])

The probability of X is less than 95 is,

P(X < 95) = [tex]P(\frac{X-\mu}{\sigma} < \frac{95-\mu}{\sigma} )[/tex]

               [tex]=P(Z < \frac{95-110}{15} )[/tex]

              [tex]=P(Z < \frac{-15}{15} )[/tex]

              = P (Z < -1)

P(X < 95)    = 0.159 (using the normal table)

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Step-by-step explanation:

It goes up and to the right ....it has a positive slope

find two convenient points   ( -3,1) and  (0,2)

 slope, m = (y1-y2) / ( x1-x2) =  (1-2) / ( -3 -0) =  1/3

Answer:

1/3

Step-by-step explanation:

The slope of a line is the [tex]\frac{rise}{run}[/tex].  Rise being how many units you go up and down, and run being how many units you go left and right.

Given a chart, we can just count how many units we go up/down and left/right, but if we were given 2 points and no chart, we would use the formula:

[tex]\frac{y2-y1}{x2-x1}[/tex]

For this example, we have a chart, so let's choose 2 solid points: (-3,1) and (0,2).

We can see that from the first point (-3,1) to get to the second point (0,2), we need to go up 1 unit.

We can also see that from going up 1 unit, we need to go right 3 units.

We can rewrite this in the formula for slope:

1/3

This means that our slope is 1/3.

Check it

To check this, we can use our slope point formula:

[tex]\frac{y2-y1}{x2-x1}[/tex]

Given the 2 points, (-3,1), and (0,2)....

[tex]\frac{2-1}{0+3}\\ =\frac{1}{3}[/tex]

Hope this helps! :)

The length of BD is 8.

We can use the property that medians of a triangle divide each other in a 2:1 ratio.

Let BD be x. Then, using this property, we can write:

CE = 2ED

FA= 2FD

BE = 2 x ED

Since EB = 12, we can substitute 12 for EB and solve for ED:

12 = 2 x DE

DE = 6

Now, the length of DB is

= 12/3 + 12/3

= 4 + 4

= 8

Therefore, the length of DB is 8.

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Answer:

Step-by-step explanation:

To check conditions for the use of the ANOVA F-test, the ratio of the largest sample variance to the smallest sample variance is useful.

To check conditions for the use of the ANOVA F-test, we need to examine histograms of the homework hours for all four samples (never attend, attend infrequently, attend frequently, and attend very frequently).

Assuming that the conditions are met for the use of the ANOVA F-test, the data do not support the alternative hypothesis that there is a relationship between church attendance and hours spent on homework each week. The p-value of 0.245 is greater than the typical significance level of 0.05, indicating that there is not enough evidence to reject the null hypothesis that there is no relationship between church attendance and hours spent on homework each week.

Answer:

1 kilogram = 2.204623 pounds

$17/kilogram = $17/2.204623 pounds

= $7.71/pound