stats please show work to explain how?

Question by anatomypro: stats please show work to explain how?
Suppose the length of time to onset of lung cancer in asbestos workers is approximately normally distributed with a mean of 26 years and a variance of 4 years squared.

a. What is the standard deviation?

b. What interval of onset times includes about 95% of the workers?
Approximate using empirical rule.



d. What is the probability that an asbestos worker gets lung cancer sooner than 22 years?


please show work so that i

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