11. A student was asked to make probability distribution for the number of incorrect answers on a 5-question quiz by randomly selecting the answer. The student's result is below.

incorrect Answers Probability

1 0.00640

2 0.05120

3 0.20480

4 0.40960

5 0.32768

a. Why isn't this a discrete probability distribution?

b. Make it a discrete probability distribution.