1. A person?s gender and the choice of their pet was recorded when 550 people were surveyed.

What was the probability a person owns a cat given they are a female?

• 0.44
• 0.24
• 0.653
• 0.367

2. A person?s gender and the choice of their pet was recorded when 550 people were surveyed.

A person selected a at random, what is the probability are a male given they own a dog?

• 0.464
• 0.54
• 0.245
• 0.529

3. You bought a new set of four tires from a tire shop recently. The shop had 500 tires in stock. Assume that 15 of these tires were defective. What is the probability that at least one of the tires you bought is defective? ( Round your answer to four decimal places)

4. A researcher wants to examine the number of Maryland households that will buy a house within the next year. If three Maryland households are selected randomly, let X be the number of the households that intend to purchase a house within the next year. What are the values that the random variable can take on?

• 1. 2. 3
• 0. 1. 2
• 0. 1. 2. 3

5. One of the requirements of a probability distribution is that probabilities must sum to 0.

• True
• False

6. The probability model below describes the number of thunderstorms that a certain town may experience during the month of August. What should the value be in the missing cell?

• 0.3
• 0.2
• -0.2
• 0.1

7. Consider the following probability distribution of the daily profit of a bakery. (Negative profit represents a loss.)

On a given day, the probability the bakery will have a profit of $200 or more is

• 0.30
• 0.80
• 0.50
• 0.20

8. Sue anne owns a medium-sized business. The probability model below describes the number of employees that may call in sick on any given day. What is the mean number of employees calling in sick each day?

X Number of Employees Sick	P(X)
0	0.05
1	0.40
2	0.30
3	0.20
4	0.05

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Female Male Dog 120 135 Cat 132 70 Other Pet 18 20 No Pet 30 25 Female Male Dog 120 135 Cat 132 70 Other Pet 18 20 No Pet 30 25 X 0 1 W|NT 2 3 4 P(X) 0.1 0.1 0.5 0.1 X -100 0 200 300 400 P(X) 0.05 0.15 0.30 0.40 0.10