5. Which of the following is a discrete random variable?
a. the average amount of electricity consuied
b. the number of patients in a hospital
c. the amount of paint used in Tepainting a building
d. the average weight of female athletes

6. Which of the following represents a subset of a sample space?
a. sample point
b. event
c. probability
d. statistics

7. Which of the following is a measure of spread of a random variable?
a. standard deviation
b. median
c. mean
d. probability