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3. 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

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3. 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 $3.27. If 55 girls in that age category are randome selected, what is the probability that their mean monthly shopping expense is between $30.00 and $3313\")? [4 marks]

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