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The variance of 40 values is 100. What is the standard deviation? A) 10 B) 0.4 C) 60 D) 25 E) 2.5 The answer key

The variance of 40 values is 100. What is the standard deviation?

A) 10

B) 0.4

C) 60

D) 25

E) 2.5

The answer key tells me that the answer is 10. But I'm not sure what steps to take to find the standard deviation from the variance. Please help me by explaining this problem step by step.

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