If research suggests that the mean number of insurance quotations a person makes in a year is 26 with a standard deviation of 4, what is the z-score for a score of 18?
A) -2
B) 11
C) 2
D) -1.41

Question

Quizplus · Accepted Answer

The z-score is calculated by subtracting the mean from the score and then dividing by the standard deviation: $z = \frac{(X - \mu)}{\sigma}$. Here, $X = 18$, $\mu = 26$, and $\sigma = 4$, so $z = \frac{(18 - 26)}{4} = \frac{-8}{4} = -2$.

If Research Suggests That the Mean Number of Insurance Quotations