SOLUTION: The mean of a normal probability distribution is 80; the standard deviation is 6. About what percent of the observations lie between 68 and 92?

SOLUTION: The mean of a normal probability distribution is 80; the standard deviation is 6. About what percent of the observations lie between 68 and 92?

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Question 1157069: The mean of a normal probability distribution is 80; the standard deviation is 6.
About what percent of the observations lie between 68 and 92?

Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
About means estimate
'68 is two sd s from 80 -2 z score'
92 is two sd s from 80 +2 z score
-2 and +2 sd s have about 95% of the observations. It is about 95 (it is exactly 95.44%)
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