Question

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. 14. What is the standard deviation of the number of students who own a cell phone in a simple random sample of 15 students? A) 0.077 B) 0.09 C) 1.16 D) 1.35