Classify each of the following random variables as either discrete or continuous.

(a) the fuel efficiency (miles per gallon) of an automobile

(b) the amount of rainfall at a particular location during the next year

(c) the distance that a person throws a baseball

(d) the number of strokes in a round of golf

(e) the weight (in ounces) of an apple

(f) the amount of water used by a household during a given month

(g) the number of traffic citations issued by the highway patrol in a particular county on a given day