Practice Questions  Probability
Name_________________________
The spinner has 8 sectors
labeled with letters. Each
sector of the spinner below
is the same size, as shown.
1
If the arrow is spun 400 times, how many times would it be expected to land on a sector labeled B?
2
A spinner contains sections which are colored
either purple, pink, or teal. The following chart
shows the probability of landing on purple and
pink. Find the missing probability.
Outcome
Probability
Purple
1
4
Pink
2
6
Teal
3
4
Alyssa has a box that contains 24 pictures of her family, 6 pictures on her dog, and 12 pictures of her
friends. Alyssa randomly chooses one picture from the box. Which statement best describes what will
likely occur?
A
She will definitely pick a picture of her family.
B
She will most likely pick a picture of her family.
C
She is equally likely to picture of her family or of her dog.
D
She is equally likely to pick a picture of her family, of her dog, or of her
friends.
For a certain game, the probability of choosing a card with the number 13 is 0.008. Find the probability of
not choosing a card with the number 13. State the likelihood of the event occurring.
5
Use the graph of a survey of 70 zoo visitors who were asked to name their favorite animal exhibit.
Based on the table, what is the probability that the next person surveyed will choose a bear or a monkey?
6
Last month, customers at a gift shop bought 40 birthday cards, 19 congratulations cards, 20 holiday
cards, and 21 thank you cards.
What is the probability that the next customer buys a birthday card?
7
8
Joe Ward’s Video Store has
received a shipment of DVDs. The
table shows the number of each type
of DVD in the shipment.
Joe selects a DVD at random from the shipment.
What is the probability that he chooses a western?
A
1
4
C
9
21
B
1
9
D
9
30
A bag contains 6 red, 4 blue, and 8 green marbles. How many marbles of each color should be
added so that the total number of marbles is 27, but the probability of randomly selecting one marble
of each color remains unchanged?
In a basketball contest, Chad predicted he would make 85 percent of his shots. He actually made 18 out of 20
shots. How did Chad’s prediction compare with his actual results?
9
A
His prediction was the same as his actual results
B
His prediction was lower than his actual results.
C
His prediction was higher than his actual results.
D
His prediction cannot be compared with his actual results.
10
The table shows the bowling
scores of 125 students.
What is the experimental
probability that the next
student will have a score
that is 125 or less?
Jaden flips a fair coin
11 100 times. Which of the
following best describes
the expected number of
times the coin would
land with tails facing
up?
A
exactly 2 times
B
exactly 50 times
C
approximately 2 times
D
approximately 50 times
12
Mrs Hellen rolled a
number cube 42 times.
She recorded that she
rolled a
ten times.
How does her results
compare with what she
should have expected?
The spinner shown was spun
13 30 times and the results were
recorded in the table below.
Letter
Actual
Expected
Results for 30
Results for 30
spins
spins
M
12
O
10
Y
8
In the third column write the results you expect to happen. Explain why the results may be different than what you
expected.
Frank is picking out his lunch from
14 the cafeteria menu below.
Sandwich
Grilled Cheese (G)
Peanut Butter Jelly
(P)
Tuna (T)
Cookie
Oreo (O)
Chocolate Chip
(C)
Drink
Milk (M)
Juice (J)
Part A Make a tree diagram of all possible lunches Frank can create by choosing one sandwich, one cookie and one
drink.
Part B Use the Fundamental Counting Principle to check your sample space.
Part C Find the probability that Frank creates a lunch with grilled cheese OR an Oreo.
Answer __________
Part D Find the probability that Frank creates a lunch with grilled cheese AND an Oreo.
Answer __________
15
Juliana has 4 blouses, 6 skirts and 10 hair bows.
Find the number of different outfits that Juliana can wear if she chooses 1 blouse, 1 skirt and 1 hair bow.
16
A box contains 6 red pens and 4 blue pens. Cory
randomly picks a pen from the box and keeps it.
Then Todd randomly picks a pen from the box.
What is the probability both boys will pick red
pens?
A
1
3
C
1
30
B
9
25
D
1
36
17
18
Players at a carnival game win about 30% of the time. Describe a simulation you can create to
determine the probability that the next four players win.
Claire tosses a coin and rolls a number cube 100
times. How many times should she expect to have
the coin show heads and roll a 1 or 2?
A
17
C
50
B
33
D
66