Question

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?


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  • CreatedSeptember 22, 2015
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