6) A rafe is selling 400 tickets at $20 each. The prizes are listed below. - a laptop worth $1600. - a tablet worth $800. - a $500 gift card. Find the expected value of purchasing one ticket. 7) Assume that 40 % of students in a college have an iphone. 3) What is the probability that in a classroom with 30 students, exactly 10 of them own an iphone? b) In a group of 5 students, what is the probability that at least one of them owns an iphone