IQ Test Scores Are Normally Distributed with a Mean of 103

Multiple Choice

IQ test scores are normally distributed with a mean of 103 and a standard deviation of 12 . An individual's IQ score is found to be 113 . Find the $z$ -score corresponding to this value.

A) $1.20$
B) $- 1.20$
C) $0.83$
D) $- 0.83$