Simple Events Worksheets Page 4
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Exercise Levels:
A: 11–26
B: 27–30
C: 31–34
Exercise Levels:
A: 11–26
B: 27–30
C: 31–34
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A set of 20 cards is numbered 1, 2, 3, . . ., 20. Suppose you pick a card at
HOMEWORK
random without looking. Find the probability of each event. Write as a
For
See
fraction in simplest form.
Exercises
Examples
P(1)
P(3 or 13)
P(multiple of 3)
11–14
1
11.
12.
13.
17–22
2
P(even number)
P(not 20)
P(not a factor of 10)
14.
15.
16.
15–16,
3
23–26
RAFFLE
The table shows those students in seventh
Lunch Raffle
grade who entered in the school drawing to win lunch
girls
25
with the principal. Suppose that only one student is
boys
15
randomly selected to win. Find the probability of
Room 10
10
each event. Write as a fraction in simplest form.
Room 11
16
P(girl)
P(boy)
17.
18.
Room 12
14
P(Room 12)
P(Room 10)
19.
20.
P(girl or boy) 1
P(Room 11)
21.
22.
P(not Room 10)
P(Room 10 or 11)
23.
24.
SOUP
A cupboard contains 20 soup cans. Seven are tomato, 4 are
25.
cream of mushroom, 5 are chicken, and 4 are vegetable. If one can is
chosen at random from the cupboard, what is the probability that it is
neither cream of mushroom nor vegetable soup? Write as a percent. 60%
VIDEOS
In a drawing, one name is randomly chosen from a jar of 75 names
26.
to receive free video rentals for a month. If Enola entered her name 8 times,
what is the probability that she is not chosen to receive the free rentals?
Write as a fraction in simplest form.
PETS
The graph shows the last
27.
Pet Store
33 types of pets that were
purchased at a local pet store.
14
Based on this, what is the
15
probability that the next pet
9
10
purchased will be a dog? Write
as a fraction in simplest form.
3
5
5
2
GAMES
For a certain game, the
28.
probability of choosing a card
0
Dogs
Cats
Birds
Snakes
Gerbils
with the number 13 is 0.008.
Type of Pet
What is the probability of not
choosing card 13? 0.992
WEATHER
The forecast for tomorrow says that there is a 37% chance of rain.
29.
Describe the complementary event and predict its probability. See margin.
ANNOUNCEMENTS
There are 90 students in the seventh grade. Fifty-two of
30.
those students are girls. If one student will be chosen at random to read the
EXTRA
morning announcements for the week, what is the probability that the
See pages 690, 712.
student is a boy?
463
Lesson 9-1 Simple Events
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