# AP Statistics

many companies "grade on a bell curve" to compare the performance of their managers and professional workers. this forces the use of some low performance ratings, so that not all workers are listed as "above average". Ford Motor company's "performance management process," for example, assigns 10% A grades, 80% B grades, and 10% C grades to the company's 18,000 managers. suppose that Ford's performance scores really are normally distributed. this year, managers with scores less that 25 received C's and those with scores above 475 received A's. what are the mean and standard deviation of the scores?

I don't want the answer, just the steps.

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1. From the Z table, the 10% tail is 1.282 std from the mean.

Since the 10% tail is used on both ends, the mean is halfway between where the tails start.

That help?

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posted by Steve

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