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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
70, 75, 80, 85, 90, 105, 105, 130, 130, 130 The list shown consists o
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09 Apr 2022, 02:58
09 Apr 2022, 02:58
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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 schoolchildren to run a distance of 400 on of 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?
A. one
B. two
C. three
D. four
E. five
The list shown consists of the times, in seconds, that it took each of 10 schoolchildren to run a distance of 400 on of 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?
A. one
B. two
C. three
D. four
E. five
Re: 70, 75, 80, 85, 90, 105, 105, 130, 130, 130 The list shown consists o
[#permalink]
09 Apr 2022, 05:05
09 Apr 2022, 05:05
1
70, 75, 80, 85, 90, 105, 105, 130, 130, 130
Mean of the data (M) = 100
Standard deviation (SD) = 22.4
1 standard deviation below the mean = M - SD = 100 - 22.4 = 77.6
Readings which are below 77.6 are 70, 75
IMO B
Mean of the data (M) = 100
Standard deviation (SD) = 22.4
1 standard deviation below the mean = M - SD = 100 - 22.4 = 77.6
Readings which are below 77.6 are 70, 75
IMO B
gmatclubot
Re: 70, 75, 80, 85, 90, 105, 105, 130, 130, 130 The list shown consists o [#permalink]
09 Apr 2022, 05:05
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