Which one of these X' variables is a discrete random variable? ...

[daltonest1984]

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 student is randomly selected and X is the number of correct answers on a two question multiple-choice quiz.
  c. A UPS package is randomly selected and X is the weight in pounds of the package.
  d. 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.

Question 2

In a randomly selected sample of 500 students at a University, 80 say they plan to graduate within 4 years. Calculate a 95 confidence interval for the proportion of all students who plan to graduate within 4 years.

[bpool94]

Answer to Question 1

B

Answer to Question 2

(0.765, 0.835)

[daltonest1984]

Thanks for the timely response, appreciate it

[xoxo123]

Gracias!