Find the standard deviation of the data summarized in the given frequency distribution.
-A test score of 54.0 on a test having a mean of 73 and a standard deviation of 10.
A)-1.9; not unusual
B)-19; unusual
C)-1.9; unusual
D)1.9; not unusual

Question

Quizplus · Accepted Answer

The z-score for a test score of 54.0 is (54.0 - 73) / 10 = -1.9. A z-score of -1.9 is not unusual, as it is within 2 standard deviations of the mean.

Find the Standard Deviation of the Data Summarized in the Given