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liraira [26]
3 years ago
10

"if the standard deviation of a group of 20 scores is 15, what is the variance?"

Mathematics
1 answer:
DerKrebs [107]3 years ago
7 0

We have been given that the standard deviation of a group of 20 scores is 15 and we are asked to find variance.

Since we know variance is square of standard deviation. In order to find out the variance of the given data we have to take the square of 15.

\text{ Variance}=\sigma^{2}\\
=15^{2}=225

Therefore, our variance is 225.


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Step-by-step explanation:

Let x represent the speed of the current.

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Time = distance/speed

Time taken to travel downstream is

6/(3 + x)

In the same amount of time, he can travel 4 miles upstream. Assuming he went against the current, it means that his total speed while travelling downstream is (3 - x). Time taken to travel upstream is

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Since the time is the same, then

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4 0
3 years ago
A street sign is 8ft 1 inch tall. How tall is it in inches?
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5 0
3 years ago
Read 2 more answers
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erastova [34]

Answer:

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Step-by-step explanation:

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Answer:

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