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23. Attendance at London Symphony concerts for the past two years showed an average of 3,000 people per performance with a standard deviation of 100

23. Attendance at London Symphony concerts for the past two years showed an average of 3,000 people per performance with a standard deviation of 100 people per performance. Attendance at a randomly selected concert was found to be 3,290. If attendance data is mound-shaped, does the attendance at the selected concert appear to be unusual?

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