In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. Do you take the free samples offered in supermarkets? About 64% of all customers will take free samples. Furthermore, of those who take the free samples, about 33% will buy what they have sampled. Suppose you set up a counter in a supermarket offering free samples of a new product. The day you were offering free samples, 311 customers passed by your counter. (Round your answers to four decimal places.) (a) What is the probability that more than 180 will take your free sample? (b) What is the probability that fewer than 200 will take your free sample? 0.5437 x (c) What is the probability that a customer will take a free sample and buy the product? Hint: Use the multiplication rule for dependent events. Notice that we are given the conditional probability P(buylsample) = 0.33, while P(sample) - 0.64. 0.2112 (d) What is the probablity that between 60 and 80 customers will take the free sample and buy the product? Hint: Use the probability of success calculated in part (c). 0.2112 Need Help? Read it Watch it Master it

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Statements and Logic

Logic is the analysis of general patterns of thoughts without regard to any specific sense of context.