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olya-2409 [2.1K]
3 years ago
13

Scores on a mathematics assessment test for​ eighth-graders have a mean of 283​, a 10th percentile of 232​, a 25th percentile of

255​, a 75th percentile of 304​, and a 90th percentile of 327. Interpret each of these numerical descriptive measures. Interpret the mean value of 283. Choose the correct answer below. A. For this​ problem, the mean value of 283 represents the variation in the test scores on a mathematics assessment test for​ eighth-graders. B. For this​ problem, the mean value of 283 represents the range of test scores on a mathematics assessment test for​ eighth-graders. C. For this​ problem, the mean value of 283 represents the average test score on a mathematics assessment test for​ eighth-graders. D. For this​ problem, the mean value of 283 represents the middle test score when the scores are arranged in ascending​ (or descending) order.
Mathematics
1 answer:
Mashcka [7]3 years ago
7 0

Answer:

C )  For this​ problem, the mean value of 283 represents the average test score on a mathematics assessment test for​ eighth-graders.

Step-by-step explanation:

10 th  percentile of 232

10 % below 232 and 90 % above 232

25 th percentile of 255

25 % below 255 and 75 % above 255

75 th percentile of 304

75 % below 304 and 25% above 304

90 th percentile of 327

90 % below 327 and 10 % above 327 .

So counting is from below to above in ascending order .

the mean of 283 represents the average of the test score

Hence option C ) is correct .

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Which of the following is the symbol for parallel lines AB and XY?
igor_vitrenko [27]

Answer

A is the symbol for parallel lines AB and XY.

Explanation

B shows that line segment AB and XY are parallel, because there are no arrows, and line segments do not extend forever.

C shows that ray AB and XY are parallel, because there is one arrow, and rays only extend on one point.

Only A shows that line AB and XY are parallel. Lines extend forever, the A shows that AB and XY are parallel, since there are arrows in both directions above AB and XY.

3 0
3 years ago
Need help with this asap!
Brums [2.3K]

Answer:

The answer to your question is   b = 8.06 cm

Step-by-step explanation:

Data

hypotenuse = c = 9 cm

long leg = b = ?

short leg = a = 4 cm

Process

This is a right triangle so we must use the Pythagorean theorem to find the length of the long leg (b)

                      c² = a² + b²

-Solve for b²

                      b² = c² - a²

-Substitution

                      b² = 9² - 4²

-Simplification

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                       b² = 65

-Result

                      b = 8.06 cm

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Find an equation of the line in the form ax+by=c whose​ x-intercept is 12 and​ y-intercept is 4​, where​ a, b, and c are integer
Lostsunrise [7]

Answer:

The equation of the line  in ax+by=c  form where a,b,c  are integers with no factor common to all​ three, and greater than or equal 0 is:

x+3y=12

Step-by-step explanation:

Given:

x-intercept = 12

y-intercept = 4

To find the equation of line in the form ax+by=c where a,b,c  are integers with no factor common to all​ three, and greater than or equal 0.

Solution:

The x-intercept is the point at which the line cuts the x-axis. The point of x-intercept is given as (x,0)

Thus, on point of the line is (12,0)

The y-intercept is the point at which the line cuts the y-axis. The point of y-intercept is given as (0,y).

Thus, on point of the line is (0,4)

Using the two points we can find the slope of the line using the slope formula.

m=\frac{y_2-y_1}{x_2-x_1}

So, slope of the line can b given as:

m=\frac{4-0}{0-12}

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m=-\frac{1}{3}

The slope intercept form of the equation of he line is given as:

y=mx+b

where m represents slope of the line and b represents the y-intercept.

So, the equation of the line can be given as:

y=-\frac{1}{3}x+4

Multiplying each term by 3 to remove fraction.

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3y=-x+12

Adding x both sides.

3y+x=-x+x+12

3y+x=12

Thus, the equation of the line  in ax+by=c  form where a,b,c  are integers with no factor common to all​ three, and greater than or equal 0 is:

x+3y=12

8 0
3 years ago
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