Question: A normally distributed random variable has a mean of 100.An observation with a raw value of 120 has a z-score of 3.What is the value

A normally distributed random variable has a mean of 100.An observation with a raw value of 120 has a z-score of 3.What is the value of the standard deviation?

A) 10

B) 6.66

C) 5

D) 3.33

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