Exercise 2: One study on managers' satisfaction with management tools reveals that 59% of all managers use self-directed work teams as a management tool. Suppose 70 managers selected randomly in Canada are interviewed. What is the probability that fewer than 35 use self-directed work teams as a management tool?

Exercise 3: In a Canadian plant, the time required to assemble a plastic module varies from 25 to 55 seconds. The assembly times are uniformly distributed. What is the probability that a plastic module assembly will take more than 42 seconds given that the task is not yet complete 30 seconds after the start of assembly?

Exercise 4: Suppose that during any hour in a large department store, the average number of shoppers is 448, with a standard deviation of 21 shoppers. What is the prob- ability that a random sample of 49 different shopping hours will yield a sample mean between 441 and 446 shoppers?