6. Question: The proportion of students who own a cell phone on college campuses across the country has incteased 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 unlvenaity is the same as nationwide. Let X = the number of students in the sample of 15 who own a cell phone. (a) What is the appropriate distribution for X? (b) On average, how many students will sample of 15 students? (c) What is the standard deviation of the number of students who cum a cell phone in a simple random sample of 15 students? (d) What is the probability that students own a cell phone? own a cell phone in a simple random all students in a simple random sample of 15