a. A score that is 9 points above the mean corresponds to the z score of z=1.50 what is the population standard deviation?

b. For a population with a standard deviation of o=12, a score of x=44 corresponds to z= -.50 what is the population mean?

c. For a sample with a mean of M=51, a score of x=59 corresponds to z=2.00 what is the sample standard deviation?