Question

The scores on the Wechsler Adult Intelligence Scale are approximately Normal with μ = 100 and σ = 15.

Answer 1

what would you like help with?

Answer 2

The score needed to be among the highest 10% of all scores is closest to

Answer 3

so you want the 90th percentile , basically

Answer 4

do you know how to read a standard normal table to find the z value that gives an area 90% to left

Answer 5

first lets find the 90th percentile z score

Answer 6

TI 84
invnorm(.90) = 1.28155

Answer 7

now change this z score to the x score

Answer 8

oh fancy no table needed :)

Answer 9

z*sigma + mean = x