on a test, assume u = 72 and a = 3.

(round all answers to two decimal places)

a)if a person's test score is 68, find their z-score

b) if a person's test core is 79, find their z-score

c)if a person's z-score is 1.83, find their x-score

d)if a person's z-score is -2.27, find their x-score