The proportion of students who own a cell phone on college campuses across the country has increased tremendously over the past few years. It is estimated that approximately 90% of students now own a cell phone. Fifteen students are to be selected at random from a large university. Assume that the proportion of students who own a cell phone at this university is the same as nationwide. Let X = the number of students in the sample of 15 who own a cell phone.

What is the appropriate distribution of X?

Select one:

a. X is N(13.5, 1.16)

b. X is Bin(15, 13.5)

c. X is N(15, 0.9)

d. X is Bin(15, 0.9)