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Question (Category: Mathematics :Statistics )
An accounting firm is planning for the next tax preparation season. From last years returns, the firm collect a systematic random sampleof 100 filings. The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140 minutes.What is the probability that the mean completion time will be more than 120 minutes?What is the probability that the mean completion time is between 1 and 2 hours, i.e., 60 and 120 minutes?

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