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Probability quiz - 7THA

Total questions: 20

Worksheet time: 2hrs 40mins

Name
Class
Date
1.
Probability can be written as ...
a)
a fraction
b)
a decimal
c)
a percent
d)
all of the above
2.

What is sample space?

a)

a process with an uncertain result

b)

a possible result of an action

c)

a list of all possible outcomes of an event

d)

a single outcome or group of outcomes

3.

When rolling a single die, the events of rolling an even number and rolling a ‘5’ are mutually exclusive.

a)

True

b)

False

4.
Clara picks a marble at random, puts it back, and then picks another marble at random.
a)
Dependent
b)
Independent
5.
Victor picks a card at random. Without putting the first card back, he picks a second card at random.
a)
Dependent
b)
Independent
6.
You pick a marble from this bag.
What is the probability you will choose either a black or white marble?
a)
3/5
b)
9/100
c)
1/10
d)
2/5
7.
What is the probability of the arrow stopping on “X” on the first spin and “F” on the second spin?
a)
5/6
b)
1/36
c)
1/3
d)
1/6
8.

Bert & Ernie choose a juice to have for breakfast.

The probability that Bert chooses orange is 3/4.

If Bert chooses orange, the probability that Ernie chooses orange is 4/5.

If Bert chooses apple the probability that Ernie chooses apple is 2/3.

Find the value of the probability marked c.

a)

1/4

b)

1/5

c)

1/3

d)

3/4

9.

Bert & Ernie choose a juice to have for breakfast.

The probability that Bert chooses orange is 3/4.

If Bert chooses orange, the probability that Ernie chooses orange is 4/5.

If Bert chooses apple the probability that Ernie chooses apple is 2/3.

Find the value of the probability marked d.

a)

1/4

b)

1/5

c)

1/3

d)

3/4

10.

Bert & Ernie choose a juice to have for breakfast.

The probability that Bert chooses orange is 3/4.

If Bert chooses orange, the probability that Ernie chooses orange is 4/5.

If Bert chooses apple the probability that Ernie chooses apple is 2/3.

Find the value of the probability marked e.

a)

1/4

b)

1/5

c)

1/3

d)

3/4

11.

Bert & Ernie choose a juice to have for breakfast.

The probability that Bert chooses orange is 3/4.

If Bert chooses orange, the probability that Ernie chooses orange is 4/5.

If Bert chooses apple the probability that Ernie chooses apple is 2/3.

What is the probability that both Bert & Ernie choose orange juice?

a)

12/20

b)

3/9

c)

2/12

d)

7/9

12.

Bert & Ernie choose a juice to have for breakfast.

The probability that Bert chooses orange is 3/4.

If Bert chooses orange, the probability that Ernie chooses orange is 4/5.

If Bert chooses apple the probability that Ernie chooses apple is 2/3.

What is the probability that Bert & Ernie choose different juices?

a)

3/20

b)

1/12

c)

14/60

d)

19/60

13.

There are 10 counters in a bag, 3 red and 7 blue.


I take one counter, then another without replacement.

Find the probability of picking two red counters.

a)

6/90

b)

5/19

c)

47/90

d)

2/9

14.

There are 10 counters in a bag, 3 red and 7 blue.


I take one counter, then another without replacement.

Find the probability of picking one of each colour counters.

a)

21/90

b)

48/90

c)

42/90

d)

10/19

15.

Two dice are rolled and it is recorded whether the result on each is odd or even. What is the probability both are odd?

a)

1/4

b)

1/2

c)

2/4

d)

3/4

16.

Two dice are rolled and it is recorded whether the result on each is odd or even. What is the probability that one is even and one is odd?

a)

1/2

b)

1/4

c)

3/4

d)

1/3

17.

A bag contains 3 lemons and 2 limes. A piece of fruit is taken from the bag and not put back. Then a second piece is taken. What is the probability of taking two limes?

a)

1/10

b)

2/5

c)

5/20

d)

4/20

18.

A bag contains 3 lemons and 2 limes. A piece of fruit is taken from the bag and not put back. Then a second piece is taken. What is the probability of taking exactly 1 lemon?

a)

12/20

b)

6/20

c)

2/20

d)

18/20

19.
What is the probability of rolling a dice and landing on a 4, and then rolling the dice again and landing on any even number?
a)
1 ⁄ 6
b)
1 ⁄ 8
c)
1 ⁄ 2
d)
1 ⁄ 12
20.

What is the probability that the person picked will be a boy given they speak german?

a)

0.7273

b)

0.4

c)

0.16

d)

0.22