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Statistics question

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Joined: 15 Jul 2019
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Statistics question  [#permalink]

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New post 04 Aug 2019, 11:31
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Question Stats:

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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 students to run a distance of 400 meters. If the standard deviation of the 10 running times is 22.4 sec, 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?


A. one
B. Two
C. Three
D. Four
E. Five
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Posts: 57281
Re: Statistics question  [#permalink]

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New post 04 Aug 2019, 11:48
ScottK wrote:
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 students to run a distance of 400 meters. If the standard deviation of the 10 running times is 22.4 sec, 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?


A. one
B. Two
C. Three
D. Four
E. Five


Discussed here: https://gmatclub.com/forum/the-list-sho ... 91966.html Hope it helps.

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Re: Statistics question   [#permalink] 04 Aug 2019, 11:48
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