3 Normally distributed
Test scores for a police exam is a normal distribution TEST,150,20.
5) Find the probability that a randomly chosen candidate’s score is greater than 165.
6) Find the cut-off score for the top 10% of test-takers.
5. Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.
6. Find Z score with .10 in smaller portion. Insert in equation above and solve for score.