Ava45018 Ava45018

26-09-2020
Mathematics

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How do you do this question?

How do you do this question class=

Respuesta :

MathPhys MathPhys

26-09-2020

Answer:

3.61

Step-by-step 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.

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