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Mathematics 9 Online
OpenStudy (anonymous):

The mean weight of 18 – year old females is 126 pounds, and the standard deviation is 15.7 pounds. If a sample of 30 females is selected, find the probability that the mean of the sample will be greater than 128 pounds.

OpenStudy (anonymous):

the mean is standard normally distributed with mean the same mean as the population and with variance the same variance as the population divided by the number of sample items...you should be able to work it out now

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