Hi

between what two values would you classify values to be below average 

but not enough to be considered unusual? between 771.5 and 915.3

Between 915.3 -71.8   and 915.3 + 71.8 (843.5 , 987.1)  1 SD

Between 915.3 -143.6   and 915.3 + 143.6 (771.7 , 1058.9) 2 SD

For the normal distribution: 

one  standard deviation from the mean accounts for about 68% of the set 

two standard deviations from the mean account for about 95%

and three standard deviations from the mean account for about 99.7%.



 

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