4. Given the following FD Mid-price of a commodity 15 25 35 45 55 Number of items sold 27 A 28 B 19 If 75% of the items were sold in birr 45 or less and most items were sold in birr 34, find the missing frequencies, mean, median, variance and standard deviation. 5. A package contains 12 resistors, 3 of which are defective. If 4 are selected, find the probability of getting one defective resistor? 6. If a microchip manufacturer claims that only 4% of his chips are defective, what is the probability that among the 60 chips chosen, exactly three are defective? 7. On the average, five smokers pass a certain street corners every ten minutes, what is the probability that during a given 10minutes the number of shokers passing will be a) 6 or fewer b) 7 or more c) Exactly 8​