Question: Use the concepts learned about the standard normal distribution (z distribution) to answer the following questions. (2 pts each)

a. What is the probability of being more than 1.68 standard deviations above the mean?

P(z > 1.68).

b. What value of z represents the 20th percentile?

c. What two z values bound the middle 50%? P( -a < z < a) = .50