Homework Help: Statistics

Posted by Tamara Wright on Wednesday, July 27, 2011 at 1:30pm.

Assume that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more? Why or why not?

Statistics - Anonymous, Monday, August 1, 2011 at 8:50pm
yes

z = ( x - 兪 ) / (冃亐併兣) = 1.732050808

P (z > 1.732050808) = 0.041632294
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