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Mathematics 15 Online
OpenStudy (anonymous):

Tim Worker is doing his budget. He discovers that the average miscellaneous expense is $45.00 with a standard deviation of $16.00. What percent of his expenses in this category would he expect to fall between $38.60 and $57.80? The z for $38.60 = - . The percent of area associated with $38.60 = %. The z for $57.80 = . The percent of area associated with $57.80 = %. Adding the two together, the percent of his expenses between $38.60 and $57.80 is %.

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