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Sudhir Kaveti
- Newbie | Next Rank: 10 Posts
- Posts: 1
- Joined: Fri Jul 01, 2011 2:11 am
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?
A. One
B. Two
C. Three
D. Four
E. Five
Can anybody help me solve this problem please.[/list]
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?
A. One
B. Two
C. Three
D. Four
E. Five
Can anybody help me solve this problem please.[/list]
