normalcdf question

suppose the average age of a registered vehicle is 72 months. assume the standard deviation is 12 months. if a random sample of 32 vehicles ia selected, find the probability that the mean of their age is more than 80 months.

asked May 6, 2014 in Statistics Answers by anonymous

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answered Jan 5 by Mathical Level 10 User (55,420 points)

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