An instructor administers an exam to a psychology class. The mean exam grade was 80, with a standard deviation of 10. Supposing you receive a score of 95, what is your z score?
A) -1.5
B) -.5
C) +.5
D) +1.5

Question

Quizplus · Accepted Answer

To calculate the z-score, we use the formula: (x - μ) / σ, where x is the score, μ is the mean, and σ is the standard deviation. 
Plugging in the values, we get: 
(95 - 80) / 10 = 1.5 
Since the score is 1.5 standard deviations above the mean, the z-score is +1.5.

An Instructor Administers an Exam to a Psychology Class