The times in (minutes) taken to complete a 200 metre run by 40 students during their training sessions are as shown in the following table: A. 9.26 OB. 8.82 Time (minutes) Number of students 2 9 15 11 3 Calculate the estimate for the standard deviation. O C. 10.08 D. 10.59 20-30 30-40 40-50 50-60 60-70

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A:

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A:

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