Questions from Business Statistics

Q: Consider our archer from Exercise 30 . 1. How many

Consider our archer from Exercise 30 . 1. How many bull-eyes do you expect her to get? 2. With what standard deviation? 3. If she keeps shooting arrows until she hits the bull-eye, how long do you exp...

Q: Suppose we choose 12 people instead of the 5 chosen in Exercise

Suppose we choose 12 people instead of the 5 chosen in Exercise 29 . 1. Find the mean and standard deviation of the number of right-handers in the group. 2. What the probability that they’re not all r...

Q: Suppose the archer from Exercise 30 shoots 10 arrows. 1

Suppose the archer from Exercise 30 shoots 10 arrows. 1. Find the mean and standard deviation of the number of bull-eyes she may get. 2. What the probability that she never misses? 3. What the probabi...

Q: It is generally believed that nearsightedness affects about 12% of all

It is generally believed that nearsightedness affects about 12% of all children. A school district tests the vision of 169 incoming kindergarten children. How many would you expect to be nearsighted?...

Q: At a certain college, 6% of all students come from

At a certain college, 6% of all students come from outside the United States. Incoming students there are assigned at random to freshman dorms, where students live in residential clusters of 40 freshm...

Q: A certain tennis player makes a successful first serve 70% of

A certain tennis player makes a successful first serve 70% of the time. Assume that each serve is independent of the others. If she serves 6 times, what the probability she gets 1. all 6 serves in? 2....

Q: A wildlife biologist examines frogs for a genetic trait he suspects may

A wildlife biologist examines frogs for a genetic trait he suspects may be linked to sensitivity to industrial toxins in the environment. Previous research had established that this trait is usually f...

Q: Suppose the tennis player in Exercise 37 serves 80 times in a

Suppose the tennis player in Exercise 37 serves 80 times in a match. 1. What are the mean and standard deviation of the number of good first serves expected? 2. Verify that you can use a Normal model...

Q: The archer in Exercise 30 will be shooting 200 arrows in a

The archer in Exercise 30 will be shooting 200 arrows in a large competition. 1. What are the mean and standard deviation of the number of bull-eyes she might get? 2. Is a Normal model appropriate her...

Q: An orchard owner knows that he’ll have to use about 6%

An orchard owner knows that he’ll have to use about 6% of the apples he harvests for cider because they will have bruises or blemishes. He expects a tree to produce about 300 apples. 1. Describe an ap...