A z score of 1.25 represents an observation that is
A) 1.25 standard deviation below the mean.
B) 0.25 standard deviations above the mean of 1.
C) 1.25 standard deviations above the mean.
D) both b and c

Question

Quizplus · Accepted Answer

A z score represents the number of standard deviations an observation is from the mean. A positive z score indicates the observation is above the mean, and a z score of 1.25 means the observation is 1.25 standard deviations above the mean. Therefore, the correct answer is C. Choice B is incorrect because it assumes a mean of 1, which is not stated in the question.

A Z Score of 1