A population of scores forms a normal distribution with a mean of µ= 40 and a standard deviation of ?= 12.
a. What is the probability of randomly selecting a score less than X = 34?
b. What is the probability of selecting a sample of n 9 scores with a mean less than M = 34?
c. What is the probability of selecting a sample of n 36 scores with a mean less than M = 34?