"IQ scores based on the Wechsler Adult Intelligence Scale are assumed to be normally distributed with a mean of 100 and a standard deviation of 15." The label 'Genius' is given to people whose IQ scores are 2 standard deviations above the mean. What IQ score do people need to have to be labeled a 'Genius'?
A) 70
B) 85
C) 115
D) 130

Question

"IQ scores based on the Wechsler Adult Intelligence Scale are assumed to be normally distributed with a mean of 100 and a standard deviation of 15." The label 'Genius' is given to people whose IQ scores are 2 standard deviations above the mean. What IQ score do people need to have to be labeled a 'Genius'?
A) 70
B) 85 
C) 115
D) 130

Quizplus · Accepted Answer

Two standard deviations above the mean would be 2 x 15 = 30. Adding this to the mean of 100 gives an IQ score of 130 as the threshold for being labeled a 'Genius.'

"IQ Scores Based on the Wechsler Adult Intelligence Scale Are