Question: 18. According to Current Population Reports, self-employed individuals in the United States in 1990 worked an average of 44.6 hours per week. with a standard

18. According to Current Population Reports, self-employed individuals in the United States in 1990 worked an average of 44.6 hours per week. with a standard deviation of 14.5. Assuming this variable is approximately normally distributed, find the proportion who averaged more than 40 hours per week.

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