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Mathematics

An employer wants to compare the commute times of 1st- and 2nd-shift employees. The two histograms show the average commute times for each group. The first bar includes average commute times greater than or equal to zero and less than 6. The second bar includes average commute times greater than or equal to 6 and less than 12, and so on. Both shifts have a mean commute of 17 minutes. Which of the following statements best compares the standard deviations of the average commute times of the shifts?