Question: please answer question 18 and 19 and 20 QUESTION 18 In a department store there are 186 customers, 57 of whome will buy at least

please answer question 18 and 19 and 20 QUESTION 18 In

please answer question 18 and 19 and 20

QUESTION 18 In a department store there are 186 customers, 57 of whome will buy at least one item. If 4 customers are selected at random, find the probability that all will buy at least one item. Round your answer to four decimal places. QUESTION 19 Statistics Canada reports that 27.97% of all deaths are attributable to heart disease. Find the mean for the number of such deaths that will occur in a typical region with 3,002 deaths. Round your answer to two decimal places. QUESTION 20 A factory manager collected data on the number of equipement breakdowns per day. From those data, she derived the probability distribution shown in the table below. X 0 1 2 P(X=x) 0.75 0.15 0.1 Find the mean and standard deviation of the number of of equipement breakdowns per day. Round your answer to two decimal places

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