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Which one of these X variables is a discrete random variable? a) An experiment in chemistry is repeated many times and X is the time

Which one of these ‘X’ variables is a discrete random variable?

a) An experiment in chemistry is repeated many times and X is the time required for a reaction to occur in seconds

b) A UPS package is randomly selected and X is the weight in pounds of the package.

c) A student is randomly selected and X is the distance they must travel in feet to go from their dorm room door to the door of their first class on Monday morning.

d) A student is randomly selected and X is the number of correct answers on a two-question multiple-choice quiz.

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