Wholesome Food Company has been hired to design a healthy menu for the cafeteria at Ridgemont High School. They want to conduct a survey to determine what percentage of Ridgemont’s
1500
15001500 students like broccoli. The survey will ask, “Do you like broccoli?”
Which of the following survey methods will allow Wholesome Food Company to make a valid conclusion about the percentage of students at Ridgemont that like broccoli?
A) Ask
100
100100 students in line at the salad bar during lunchtime for one week.

B)
Assign a number to each student, and use a computer program to generate
100
100100 different random numbers between
1
11 and
1500
1500

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?