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posted by tonja on Thursday, February 9, 2012 at 12:11pm.

If the mean value of the weight of a particular brand of dog food is 20.6 lb and the standard deviation is 1.3, assume a normal distribution and calculate the amount of product produced that falls below the lower specification value of 19.7 lb.

Z = (score-mean)/SD Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.

19.7-20.6/1.3 = -.69 = 25% or 25 percent are less than 19.7 pounds

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