Classify the following random variables according to whether they are discrete or continuous:
a. The number of words spelled correctly by a student on a spelling test
b. The amount of water flowing through the Hoover Dam in a day
c. The length of time an employee is late for work
d. The number of bacteria in a particular cubic centimeter of drinking water
e. The amount of carbon monoxide produced per gallon of unleaded gas
f. Your weight