College Of The Canyons Math 140 Exam 1 Amy Morrow printable pdf download

College Of The Canyons Math 140 Exam 1 Amy Morrow

College of the Canyons

Math 140 Exam 1

Amy Morrow

Name:

Answer the following questions NEATLY. Show all necessary work directly on the exam.

Scratch paper will be discarded unread. One point each part unless otherwise marked.

1. Dogs

(a) The SPCA collects the following data about the dogs they house. Which is categorical? (Choose

the best answer)

A. age

B. number of days housed

C. veterinary costs

D. breed

E. weight

(b) Which of the variables in the previous question, collected for only German Shepherds is most likely

to be described by a Normal model? (Choose the best answer)

A. veterinary costs

B. weight

C. age

D. number of days housed

E. breed

2. Owners of an exercise gym believe that a Normal model is useful in projecting the number of clients

who will exercise in their gym each week. They use a mean of 800 clients and a standard deviation of

90 clients.

(a) Draw and clearly label this model.

Solution:

(b) What is the ﬁrst quartile of the weekly number of clients?

Solution: Answer: 739.

3. Suppose that a Normal model describes the acidity (pH) of rainwater, and that water tested after last

week’s storm had a z-score of 1.8. This means that the acidity of that rain (Choose the best answer)

A. varied with a standard deviation of 1

College Of The Canyons Math 140 Exam 1 Amy Morrow