11. The scores of individual students on the ACT composite college entrance exam follow a normal distribution with a mean of 28.6 and a standard deviation of 4.3. (a) What is the probability that a single student selected at random will score more than 33 on the ACT? (b) The average score for a sample of 75 students is 30.2. Is this an expected event? Explain. (c) Between what two values should we expect to find the average score for a sample of size 75? 12. The mean level of unemployment for men in 1980, for countries reporting, was 6.17 percent with a standard deviation of 3.25 percent. What is the probability the mean level of unemployment for a sample size of 90 countries will be between 5 and 7.5 percent