Given a normal distribution with a mean of 80 and a standard deviation of 20, which z-score would correspond to an observation of x = 50?
A) z = +3.0
B) z = +2.0
C) z = +1.5
D) z = -1.5

Question

Quizplus · Accepted Answer

To find the z-score, we use the formula z = (x - μ) / σ, where x is the observation, μ is the mean, and σ is the standard deviation. Plugging in the values, we get z = (50 - 80) / 20 = -1.5. Therefore, the answer is D.

Given a Normal Distribution with a Mean of 80 and a Standard