Students test scores were used in this study. From this study we found the average student test score to be a 75 and the standard deviation to be 5.

a) If John scored a 68 on his test, what is his Z score?

b) Sarah has a Z score of 82, what was her score on the exam?

c) Using what you know about a normal distribution, how many students scored at or above a 71 on this exam? (Hint: it may help to draw a normal distribution)