Unit 11 Probability
1. To pick teams, the gym teacher puts the names of 8 boys and 6 girls in a bag, as
shown below. The table shows the names.
Boys
Girls
Hasan
Preija
Ivan Sunetra
Kieran
Ling
Manuel Minon
Mohamed
Sarah
Paul Jessica
Robert
Salvatore
The first 3 names picked at random from the bag were Paul, Jessica and Sarah.
The names are not put back in. What is the probability that the next name picked
at random will be a boy?
2. Chloe’s parents are buying a car. They want to pick 1 colour at random from 4
possible car colours. Which of the following methods should they use?
Flip a coin.
Toss a 6-sided number cube with 1 through 6 on the faces.
Use a spinner with 4 equal-sized sections labelled with the 4 possible
colours.
Pick one card from 10 cards with 1 of the 4 colours written on each face.
3.
The spinner below has 8 equal-sized sections.
The spinner is spun one time. What is the probability that the arrow will land in a
section with a number greater than 3?
0.125
0.250
0.625
0.750
4. Which of the following represents the probability of an event that is very likely
to occur?
0
0.15
0.85
1
5. Jason has a jar that holds one dime, two nickels, and one quarter. He randomly
removes three coins from the jar. Which combination is not a possible outcome?
one dime, one nickel, and one quarter
one quarter and two dimes
one dime and two nickels
two nickels and one quarter
6.
A bag contains 12 marbles.
If Angelina picks one marble from the bag without looking, what is the
probability that she will pick a black marble?
7. Jane has a package of 40 cards: 30 of the cards are red and 10 of the cards are
black. If Jane randomly picks 8 cards, how many cards should she expect to be red?
2
4
6
8
8. Diane tossed a coin 20 times. She recorded whether the coin landed heads up or
tails up. The results are shown in the table below.
What fraction of the coin tosses landed tails up?
9.
Sara draws the spinner shown below. It is divided into 5 equal sections.
If Sara spins the arrow 50 times, how many times should she expect the arrow to
land on section E?
5
10
25
45
10. A circle is divided into sections of equal size.
What is the probability that the spinner will stop on red?
1 out of 4
3 out of 8
3 out of 4
1 out of 2
11.
A number cube is tossed and a coin is flipped.
Using the tree diagram, determine which of the following events is most likely
to occur.
Tails appears on the coin.
Heads appears on the coin, and a 4 appears on the number cube.
A 3 appears on the number cube.
Heads appears on the coin, and a 3 appears on the number cube.
12.
A school requires students to participate in a team sport and play a musical
instrument.
You are offered basketball and soccer as the team sports, and keyboard, drums and
clarinet as the musical instruments.
Which diagram below shows all the possible choices for you?