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Probability using Normal distribution: Z score.

Shaver Manufacturing, Inc., offers dental insurance to its employees. A recent study by human resource director shows the annual cost per employee per year followed the normal probability distribution, with a mean of $1,280 and a standard deviation of $420 per year.

a. What fraction of employees cost more than $1,500 per year for dental expenses?

b. What fraction of employees cost between $1,500 and $2,000 per year?

c. estimation the percent that did not have any dental expense.

d. What was the cost for 10 percent of employees who incurred the highest dental expense?

Statistics and Probability, Statistics

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