Jenna scored 40 on a standardized test of reading ability where the mean score is 50 and the standard deviation is 10.Based on this information, what is Jenna's z score?
A) -2.0
B) 2.0
C) 1.0
D) -1.0

Question

Quizplus · Accepted Answer

To calculate the z-score, we use the formula

z = (x - μ) / σ

where x is the individual score, μ is the mean, and σ is the standard deviation.

Plugging in the given values, we get

z = (40 - 50) / 10 = -1

Therefore, Jenna's z-score is -1.0. Option D is the correct answer.

Jenna Scored 40 on a Standardized Test of Reading Ability