A shoe store salesman at ABC Shoes Inc. sells an average of 85 pairs of shoes a month, with a standard deviation of 11 pairs of shoes. The store wants to identify the lowest-performing shoe salesmen in its workforce - those that are selling in the bottom 40%. There are a total of 24 salesmen that are being reviewed. What are the highest monthly sales in the group of lowest-performing shoe salesmen

Amachine that produces a special type of transistor (a component of computers) has a 2% defective rate. the production is considered a random process where each transistor is independent of the others. (a) what is the probability that the 10th transistor produced is the first with a defect? (b) what is the probability that the machine produces no defective transistors in a batch of 100? (c) on average, how many transistors would you expect to be produced before the first with a defect? what is the standard deviation? (d) another machine that also produces transistors has a 5% defective rate where each transistor is produced independent of the others. on average how many transistors would you expect to be produced with this machine before the first with a defect? what is the standard deviation? (e) based on your answers to parts (c) and (d), how does increasing the probability of an event a↵ect the mean and standard deviation of the wait time until success?