Probability And Statistics Worksheets Page 15
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42Find the probability of not selecting red or blue.
P(neither red nor blue)
1
P(red or blue)
2
1
5
3
5
3
The probability that you will not select a red or blue marble is
.
5
T
T
E
RY
HESE
XERCISES
1. A die is rolled. Find the probability of rolling a 1 or a 2.
2. Two coins are tossed. Find the probability that the coins show two heads or
one tail and one head.
3. A card is drawn at random from a standard deck of playing cards. Find the
probability that it is a 7 or a black card.
4. Two dice are rolled. Find the probability that the sum of the numbers is not
greater than 5.
5. Each student in your class writes his or her full name on a piece of paper.
The pieces are put in a box and one is chosen without looking. What is the
probability that your name will not be chosen?
P
E
RACTICE
XERCISES • For Extra Practice, see page 690.
GAMES
A player rolls two 6-sided dice.
6. List the sample space for the rolls.
7. Find the probability that the sum of the numbers rolled is odd and greater
than 5.
8. Find the probability that the sum of the numbers rolled is either 8 or 10.
9. Find P(not even).
10. Find P(neither odd nor sum of 6).
SPORTS
Suppose you are on a team in the midst of a losing streak. The coach
decides to “shake up” the line-up. He chooses the batting order by putting nine
players’ names into a hat and pulling them out one by one. The player whose
name is drawn first bats first, the second bats second, and so on.
11. What is the probability you will bat second or fourth?
12. What is the probability you will bat fifth, or in the first third of the batting
order?
13. What is the probability you will bat first, or in the first third of the batting
order?
14. What is the probability you will bat in the last third of the batting order, or in
an odd-numbered position?
15.
BUSINESS
Ms. Garrett plans to select a worker at random for a special
training seminar. If there are 14 workers in sales, 6 in accounting and 5 in
personnel, what is the probability that the worker will be from either sales or
accounting?
394
Chapter 9 Probability and Statistics
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