Question

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?

Answer 1

yes

z = ( x - ƒÊ ) / (ƒÐ€ãƒÅ) = 1.732050808

P (z > 1.732050808) = 0.041632294
1 day ago