statistic

You draw a random sample of 300 employee records from the personnel file and find that the
average years of service per employee is 6.3, with a standard deviation of 3.0 years.
a. What percentage of the workers would you expect to have more than 9.3 years of service?
b. What percentage would you expect to have more than 5.0 years of service?

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  1. Z = (score - mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions from your Z scores.

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