A person with an obtained IQ score of 115 would have a z score of:
A) +1
B) +2
C) 0
D) -1

Question

Quizplus · Accepted Answer

The mean IQ score is typically set at 100 with a standard deviation of 15. Using the formula for calculating the z-score:
z = (x - μ) / σ
where:
x = obtained IQ score (115 in this case)
μ = mean IQ score (100 in this case)
σ = standard deviation (15 in this case)
z = (115 - 100) / 15
z = 1
Therefore, the z-score for an obtained IQ score of 115 is +1.

A Person with an Obtained IQ Score of 115 Would