Page 564 - Basic College Mathematics with Early Integers

S E C T ION 7. 4 I COUNTING AND INTRODUCTION TO PROBABILITY 541

Suppose the spinner shown is spun once. Find the probability of each event. See Examples 3 through 5.

19. The result of the spin is 2.

20. The result of the spin is 3.

21. The result of the spin is 1, 2, or 3. 22. The result of the spin is not 3.

23. The result of the spin is an odd number. 24. The result of the spin is an even number.

If a single choice is made from the bag of marbles shown, find the probability of each event. See Examples 3 through 5.

25. A red marble is chosen.

26. A blue marble is chosen.

27. A yellow marble is chosen.

28. A green marble is chosen.

29. A green or red marble is chosen. 30. A blue or yellow marble is chosen.

A new drug is being tested that is supposed to lower blood pressure.This drug was given to 200 people and the
results are shown below. See Examples 3 through 5.

Lower Higher Blood Pressure
Blood Pressure Blood Pressure Not Changed
152 38 10

31. If a person is testing this drug, what is the probability 32. If a person is testing this drug, what is the probability
that his or her blood pressure will be higher? that his or her blood pressure will be lower?

33. If a person is testing this drug, what is the probability 34. What is the sum of the answers to Exercises 31, 32,
that his or her blood pressure will not change? and 33? In your own words, explain why.