A manager of a department store is interested in determining the percentage of people attracted to his store by magazine advertising. Doing an extensive survey, he finds that the average number of people in his store on any given day who have seen the advertising is 200, while the standard deviation of this group is 40. Assuming that the number of people in the store who have seen the advertising has a normal distribution.
(a) Determine the probability that between 155 and 220 people will see the advertisement.
(b) Determine the probability that less than 230 people will see the advertisement.
(c) Determine the probability that less than 130 people will see the advertisement.

1. an economy consists of three workers: larry, moe, and curly. each works 10 hours a day and can produce two services: mowing lawns and washing cars. in an hour, larry can either mow one lawn or wash one car; moe can either mow one lawn or wash two cars; and curly can either mow two lawns or wash one car. a. calculate how much of each service is produced under the following circumstances: a. all three spend all their time mowing lawns. b. all three spend all their time washing cars. c. all three spend half their time on each activity d. larry spends half of his time on each activity, while moe only washes cars and curly only mows lawns b. using your answers to part a, draw a production possibilities frontier and label points a, b, c, and d on your graph. explain why the production possibilities frontier has the shape it does. c. are any of the allocations calculated in part a inefficient? explain.