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by danjuma » Mon Oct 11, 2010 8:24 pm
70, 75, 80, 85, 90, 105, 105, 130, 130, 130.

The lists above consists of the times in seconds , it took each of 10 children to run a distance of 400m. If the standard deviation of the times is 22.4s, how many of the 10 running times are more than 1 standard deviation below the mean

a.1 b.2 c.3 d.4 e.5
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by limestone » Mon Oct 11, 2010 8:42 pm
This topic has been posted before. Please check this link:

https://www.beatthegmat.com/standard-dev ... 68152.html

Hope it helps.
"There is nothing either good or bad - but thinking makes it so" - Shakespeare.
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