According to a recent report, people smile an average of = 62 time per day. Assuming

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According to a recent report, people smile an average of μ = 62 time per day. Assuming that the distribution of smiles is approximately normal with a standard deviation of σ = 18, find each of the following values.
a. What proportion of people smile more than 80 times a day?
b. What proportion of people smile at least 50 times a day?
Distribution
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Essentials Of Statistics For The Behavioral Sciences

ISBN: 9781133956570

8th Edition

Authors: Frederick J Gravetter, Larry B. Wallnau

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