The scores on the Wechsler Adult Intelligence Scale are appr

The scores on the Wechsler Adult Intelligence Scale are approximately Normal with µ = 100 and =15 If you scored 130, your score would be higher than approximately what percent of adults? A. 92% B. 95% C.97.5% D.99.7%

Solution

using standard variable Z

P( x < 130)

P( z < [130 - 100 ] / 15 )

P( z < 2 ) =1- 0.0228 = 0.9772 = 97.5 %