standard deviation (gmat prep q)

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cans: Legendary Member; Posts: 1309; Joined: Mon Apr 04, 2011 5:34 am; Location: India; Thanked: 310 times; Followed by:123 members; GMAT Score:750

by cans » Wed May 25, 2011 7:39 pm

how many of the 10 running times are more than 1 standard deviation below the mean of the 10 running times?

Mean = 100
S.D. = 22.4
100-22.4=77.6
80 is less than 1 standard deviation below the mean..
and we are supposed to find times more than 1 S.D below the mean..
So answer is 2 (70 and 75 which are more than 1 S.D. below the mean)

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