[問題] pp2-ps 166
166. 17879-!-item-!-187;#058&011634
70, 75, 80, 85, 90, 105, 105, 130, 130, 130
The list shown consists of the times, in seconds, that it took each of 10
schoolchildren to run a distance of 400 meters. If the standard deviation of
the 10 running times is 22.4 seconds, rounded to the nearest tenth of a
second, how many of the 10 running times are more than 1 standard deviation
below the mean of the 10 running times?
請問最後一句是什麼意思
表示要超過一個標準差在平均之下
所以答案是2個
謝謝
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11/09 01:45, , 1F
11/09 01:45, 1F
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