Question

The weights of cereal boxes was found to be normally distributed. The mean is 16 oz and the standard deviation is 0.5 oz. From a sample of 250 boxes about how many should weigh between 15.5 oz and 17 oz?
Z = (score-mean)/SEm

SEm = SD/√n

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability between the two Z scores. Multiply by 250.
203 boxes
40

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