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A population of 1,000 students spend an average of $10.50 a day on dinner. The standard deviation of the expenditure is $3. A simple random sample of 64 students is taken. What is the probability that these 64 students will spend a combined total of more tahn $715.21? What is the probability that these 64 students will spend a combined total between $703.59 and $728.45?

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