In a set of 400 values, the mean is 121 and the standard deviation is 14. Estimate how many values fall in between each interval

a) 107 - 135

b)93 - 149

c) 79 - 163

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  1. Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores. Use the proportions between Z and mean and multiply by 400.

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