What proportion of people smile more than 80 times a day

Reference no: EM13900239

According to a recent report, people smile an average of µ 5 62 time per day. Assuming that the distribu- tion of smiles is approximately normal with a standard deviation of s 5 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?

Reference no: EM13900239

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