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What is the probability that a sample mean of less than 90

An accountant for a large department store will study the dollar amounts of individual accounts receivable from charge customers by taking a simple random sample of 225 accounts. Presume that the population of charge accounts has a distribution with a mean of $100 and a standard deviation of $30. What is the probability that a sample mean of less than $90 would be observed in any particular sample of size 225?

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Business Management: What is the probability that a sample mean of less than 90

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