12. For a normal distribution with a mean of 80 and a standard deviation of ...

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12. For a normal distribution with a mean of  80 and a standard deviation of  20, find the proportion of the population corresponding to each of the following scores.

a. Scores greater than 85.

b. Scores less than 100.

c. Scores between 70 and 90.

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Essentials Of Statistics For The Behavioral Sciences

ISBN: 9780495812203

7th Edition

Authors: Frederick J. Gravetter, Larry B. Wallnau

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