On the first statistics exam, the class average was 70 with a standard deviation of 6.Adam scored 82.What is his z score?
A) -1.0
B) -2.0
C) 6.0
D) 2.0

Question

Quizplus · Accepted Answer

Formula for calculating z-score is (x - μ) / σ
Here, Adam's score is 82 which is x.
Class average is 70 which is μ.
Standard deviation is 6 which is σ.

Putting the values in the formula we get,
z-score = (82 - 70) / 6 = 2.0

Therefore, the correct answer is D) 2.0

On the First Statistics Exam, the Class Average Was 70