10.8 Use the information from Problem 10.7 to answer the following (show your work):

a. What is the predicted cumulative probability for a boy to reach the fourth proficiency level (level 3) or less? What is the predicted cumulative probability for a boy to reach the third proficiency level (level 2) or less?

b. What is the probability that a boy would be at the fourth proficiency level (level 3)? What is the same predicted probability for a girl?

c. What is the probability that a boy would be at the highest proficiency level (level 4)? What is the same predicted probability for a girl?