An

astronomy

quiz contains

twelve

multiple-choice questions. Let x represent the number of questions a student answers correctly.

a. Is x a continuous or discrete random variable?

b. What are the possible values of x?

a. Is x a continuous or discrete random variable?

Continuous

Discrete

b. What are the possible values of x?

x=

(Use a comma to separate answers as needed. Use ascending order.)

2.A landscaping company currently has an inventory of

11

fruit trees,

8

pine trees, and

12

maple trees. It plans to give 4 trees away at next Saturday's lawn and garden show in the city park. The 4 winners can select which type of tree they want. Assume they select randomly.

a. What is the probability that all 4 winners will select the same type of tree?

b. What is the probability that 3 pine trees will be selected and the other tree will be a maple?

c. What is the probability that no fruit trees and 2 of each of the others will be selected?

a. The probability is

enter your response here.

(Round to four decimal places as needed.)

b. The probability is

enter your response here.

(Round to four decimal places as needed.)

c. The probability is

enter your response here.

(Round to four decimal places as needed.)