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March 28, 2015

March 28, 2015

Posted by **Hemant** on Saturday, April 17, 2010 at 1:07am.

- MAth -
**Damon**, Saturday, April 17, 2010 at 7:40amsigma = sqrt(25) = 5

64 - 59 = 5

so we want to know what percent scored 1 sigma or more above mean.(z=1)

well .5 or 50% score between mean and infinity

and given is .3414 or 34.14% score between mean and z = 1

so

50-34.14 = 15.86 % or 79 score 64 or above

Now 69 is 2 sigma above (z=2) and 54 is 1 sigma below

so we want between z = -1 and z = +2

well we know that 34.14% are between z=-1 and mean and .4773 or 47.73^ are between mean and z=2

so

34.14 + 47.73 = 81.87 % are between

.8187 * 500 = 409

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