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According to the latest financial reports from a sporting goods store, the mean sales per customer was $75 with a population standard deviation of $6.

According to the latest financial reports from a sporting goods store, the mean sales per customer was $75 with a population standard deviation of $6. The store manager believes 39randomly selected customers spent more per transaction.

What is the probability that the sample mean of sales per customer is between $76 and $77dollars?

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