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According to the U.S. Census Bureau, the mean of the commute time to work for a resident of Portland, Maine is 24.8 minutes. Assume that the standard deviation of the commute time is 4.5 minutes to complete parts (a) through (c). (a) What minimum percentage of commuters in Portland has a commute time within 2 standard deviations of the mean? _____% (Round to one decimal place as needed.) (b) What minimum percentage of commuters in Portland has a commute time within 1.5 standard deviations of the mean? What are the commute times within 1.5 standard deviations of the mean? The minimum percentage of commuters in Portland that has a commute time within 1.5 standard deviations of the mean is ___%. (Round to one decimal place as needed.) The commute times within 1.5 standard deviations of the mean are between ____and____ minutes. (Type integers or decimals. Do not round. Use ascending order.) (c) What is the minimum percentage of commuters who have commute times between 11.3 minutes and 38.3 minutes? ___% (Round to one decimal place as needed.)
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