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# Statistics question

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Intern
Joined: 15 Jul 2019
Posts: 12

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04 Aug 2019, 11:31
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (02:01) wrong based on 1 sessions

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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
Math Expert
Joined: 02 Sep 2009
Posts: 57281

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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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