Assume X and Y are indepndent. Assume that X has mean 10 and standard deviation 8. Assume Y has mean 12 and standard deviation 6. What is the standard deviation of the variable Z = X + Y. a. 8 b. 6 c. 10 d. 12

Explanation:

Given

Required

This is calculated as:

Calculate

We have:

Calculate

We have:

So, we have:

solution:

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