Find the Z-Score Corresponding to the Given Value and Use

Multiple Choice

Find the z-score corresponding to the given value and use the z-score to determine whether the value is unusual. Consider a score to be unusual if it is at least three standard deviations above or Below the mean. Round the z-score to one decimal place, if necessary. A test score of 93.4 on a test having a mean of 73 and a standard deviation of 12.

A) 1.7; not unusual
B) -1.7; not unusual
C) 1.7; unusual
D) 20.4; unusual