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3 years ago

Pete’s grade on a test was within 5 points of his class average of 94. What is his range of grades on the test?

Mathematics

2 answers:

d1i1m1o1n [39]3 years ago

7 0

I'm pretty sure it would be 89-99.

irga5000 [103]3 years ago

6 0

Answer: 89 to 99

Step-by-step explanation:

We know that the range of data is given by :-

$\overline{x}\pm E$ , where $\overline{x}$ ios the average of data and E is the margin of error.

Given : Margin of error = $\pm 5$

Class average = $94$

Then, the range of grades on the test will be :-

$94\pm 5=(94-5,\ 94+5)=(89,\ 99)$

Hence, the range of grades on the test = 89 to 99

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<h3>How to calculate the correlation coefficient</h3>

The correlation coefficient (r) is calculated as:

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Using the given parameters, we have:

$r = \frac{20 *8249 - 1257* 116}{\sqrt{[20 * 98823 - 1257^2][20 * 836 - 116^2}}$

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$r = \frac{19168}{\sqrt{[396411*3264}}$

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Evaluate the root

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Evaluate the quotient

$r = 0.53$

Hence, the correlation coefficient is 0.53

Read more about correlation coefficient at:

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2 years ago

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