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How do you do this question?
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How do you do this question?

How do you do this question?-example-1
User Timfeirg
by
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1 Answer

7 votes

Answer:

3.61

Explanation:

The standard deviation of X is 2, so the variance is 4.

The standard deviation of Y is 1. The standard deviation of 3Y is 3, so the variance is 9.

The variance of Z is 4 + 9 = 13

So the standard deviation is √13 = 3.61.

User CBHacking
by
8.4k points
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