A local amusement park has 30 rides that park visitors can go on. The following table shows the relative frequency distribution for the number of rides that a park visitor will typically go on during one day at the park. The table also shows the deviation, or difference, from 21, the mean of the distribution. Number of rides and attractions 10 15 20 Deviation -11 -6 -1 Relative frequency 0.1 0.2 0.2 Which of the following is closest to the standard deviation of the distribution? 25 4 0.4 30 9 0.1

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