18. According to a recent report, people smile an average of μ = 62 times 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 smiles more than 80 times a day? b. What proportion of people smiles at least 50 times a day? 190 chaPTER 6 | Probability Copyright 2017 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the Gravetter, Frederick J. Statistics for The Behavioral Sciences (p. 190). Cengage Learning. Kindle Edition.
18. According to a recent report, people smile an average of μ = 62 times 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 smiles more than 80 times a day? b. What proportion of people smiles at least 50 times a day? 190 chaPTER 6 | Probability Copyright 2017 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the
Gravetter, Frederick J. Statistics for The Behavioral Sciences (p. 190). Cengage Learning. Kindle Edition.
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