According to the International Mass Retail Association, girls aged 13 to 17 spend an average of $31.20
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According to the International Mass Retail Association, girls aged 13 to 17 spend an average of $31.20 on shopping trips in a month. Assume that the amounts have a standard deviation of $8.27. If 85 girls in that age category are randomly selected, what is the probability that their mean monthly shopping expense is between $30.00 and $33.00?
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