Problem 4 The scores of individual students on the American College Testing (ACT)
composite college entrance examination have a normal distribution with mean
18.6 and standard deviation 5.9.
4a. What is the probability that a single student randomly is chosen from all those
taking the test, scores 21 or higher? Round your percentage to 2 decimals.
Your answer
4b. What is the probability that the mean score of an SRS of 40 students chosen
from all those taking the test is 21 or higher? Round your percentage to 2
decimals.
Your answer