1.A random sample ofn=4 scores is obtained from a normal population with= 20 and= 4.What is the probability of obtaining a mean greater than M = 23 for this sample?

2.In a population with = 60, a score of X = 64 corresponds to a z-score ofz= +1.00, what is the population standard deviation?

3.For a population with= 80 and= 12, what is the z-score corresponding to X = 98?

4.An Introductory Sociology class has 7 freshman males, 15 freshman females, 8 sophomore males, and 12 sophomore females.If one student is randomly selected from this class, what is the probability of getting a sophomore?