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Length of employment at a certain firm seems to be a normal random variable with mean = 11 years and a standard deviation of =

Length of employment at a certain firm seems to be a normal random variable with mean = 11 years and a standard deviation of = 5 years.

(a) What proportion of people make it to 10 years?

(b) What proportion of people leave in the first three years?

(c) If 200 people start this year, what is the probable number of them that will still be there after 7 years?

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