"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." What percentage of adults have IQ scores between 95 and 110?
A) 12.93%
B) 25.14%
C) 37.07%
D) 37.79%

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." What percentage of adults have IQ scores between 95 and 110?
A) 12.93% 
B) 25.14%
C) 37.07%
D) 37.79%

Quizplus · Accepted Answer

The percentage of adults with IQ scores between 95 and 110 can be calculated using the normal distribution formula:P(95 < X < 110) = P(Z < (110 - 100) / 15) - P(Z < (95 - 100) / 15)= P(Z < 0.67) - P(Z < -0.33)= 0.7486 - 0.3707= 0.3779Therefore, the percentage of adults with IQ scores between 95 and 110 is 37.79%.

"IQ Scores Based on the Wechsler Adult Intelligence Scale Are