Cameron is performing a study on the IQ of groups in various areas. He has calculated that the average IQ of Group A is 105 with a standard deviation of 10. What is the z-score for someone with an IQ of 98?
A) 0.7
B) -0.7
C) 0.9
D) 0.1

Question

Quizplus · Accepted Answer

The z-score is calculated by subtracting the mean from the individual score and then dividing by the standard deviation: $z = \frac{(X - \mu)}{\sigma}$. For an IQ of 98 in Group A, $z = \frac{(98 - 105)}{10} = -0.7$.

Cameron Is Performing a Study on the IQ of Groups