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    Normal Distribution

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    Shaver Manufacturing, Inc., offers dental insurance to its employees. A recent study by the
    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 the employees cost more than $1,500 per year for dental expenses?
    b. What fraction of the employees cost between $1,500 and $2,000 per year?
    c. Estimate the percent that did not have any dental expense.
    d. What was the cost for the 10 percent of employees who incurred the highest dental

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