Use the chart to answer the following probability questions:

Very Easy to follow Average to follow Very Difficult to follow Impossible to Follow

male 51 39 27 19

Female 47 45 22 20

1) What are the totals for the following?

a) Males

b) Females

c) Very Easy to Follow

d) Average to Follow

e) Very Difficult to Follow

f) Impossible to Follow

g) Total number of people interviewed

2) One of these people is randomly selected. Find the probability that this individual is NOT male?

3) One of these people is randomly selected. If it is known that this person found the instructions very difficult to follow, find the probability that this person is male.

4) One of these people is randomly selected. If it is known that this person is male find the probability that this found the instructions very difficult to follow.

5) One of these people is randomly selected. If it is known that this person is female find the probability that this found the instructions very easy to follow.

6) Find the probability that a randomly selected person found the directions average to follow.

The question, “Do you smoke?” was asked of 100 people. Results are shown in the table.

Yes No Total

Male 19 41 60

Female 12 28 40

Total 31 69 100

7) Find the probability that a randomly selected person was male.

8) Find the probability that a randomly selected does NOT smoke.

9) Find the probability that a randomly selected person does not smoke if it is known that they are male.

10.) Find the probability that a randomly selected person is female if it is known they smoke.

11) Suppose the probability that tomorrow will be a snow day is .55. Suppose the probability that tomorrow is a snow day AND it is Friday is .25. What is the probability that tomorrow is Friday, if you know tomorrow is a snow day?

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