Suppose that the average income of the engineers hired at REDUNO presents an approximately normal behavior with a mean of $17,000and a standard deviation of $3,000 a) What percentage of the employees will have incomes greater than $20,000 ? b) In a random sample of 50 employees, about how many people can be expected to have incomes of less than $15,000 ?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Suppose that the average income of the engineers hired at REDUNO presents an approximately normal behavior with a mean of $17,000and a standard deviation of $3,000

a) What percentage of the employees will have incomes greater than $20,000 ?
b) In a random sample of 50 employees, about how many people can be expected to have incomes of less than $15,000 ?

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