Suppose that in a class with 50 students in it with an average score on an exam of 30 and a standard deviation of 10, John gets a score of 45. Calculate his z score and explain what it tells you.

Question

Quizplus · Accepted Answer

The Answer is John's z score is (45-30)/10

\rightarrow

15/20 = 1.5 So John's z score is 1.5, and this tells us that John's test score is 1.5 standard deviations above the mean for his class.

Suppose That in a Class with 50 Students in It