(Answered) In exercise 4 let xj denote the number of juniors in the

Statistics

In Exercise 4, let XJ denote the number of juniors in the random sample of 15 students, and let X4 denote the number of seniors in the sample. Find the value of £( X, - X,) and the value of Var( X, - X,).

Exercise 4

Suppose that 16 percent of the students in a certain high school are freshmen, 14 percent are sophomores, 38 percent are juniors, and 32 percent are seniors. If 15 students are selected at random from the school, what is the probability that at least 8 will be either freshmen or sophomores?

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