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Question 4 A tele-sales centre has found that 65% of the people they phone hang up before nding out what products are being sold. The

Question 4 A tele-sales centre has found that 65% of the people they phone hang up before nding out what products are being sold. The salesmen call these \"hang-ups\". Sixty calls were made in the last 30 minutes. a) What is the probability that half the calls were hang-ups? b) What is the probability that 38 to 40 of the calls were hang-ups

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