9. Scores on the SAT form a normal distribution with a mean of 500 and a standard deviation of 100. a.)What is the minimum score necessary to be in the top 20% of the SAT distribution?

b.) Find the range of values that defines the middle 80% of the distribution of SAT scores?

10. For a normal distribution, find the z-score that separates the distribution as follows:

a.) Separate the highest 30% from the rest of the distribution?

b.) Separate the lowest 40% from the rest of the distribution?

c.) Separate the highest 75% form the rest of the distribution?