If the standard deviation of the score on this test is zero, we should conclude
A) nobody received even one question correct.
B) half the scores were below the mean.
C) half the scores were above the mean.
D) a computational error was made.
E) everybody received the same score.

Question

Quizplus · Accepted Answer

If the standard deviation is zero, it means there is no variability in the scores. The only way this can happen is if every single person received the exact same score. Therefore, the correct answer is E - everybody received the same score.

If the Standard Deviation of the Score on This Test