Probability Practice 1: Experiments, Events and Basic Probability

Vocabulary

Question 1mcq

A coin is tossed once. In probability language, what is the experiment?

A.A sure event

B.Tossing the coin once

C.Getting heads only

D.The number

1

Question 2mcq

In rolling a die, which option is an event?

A.Getting an even number

B.The die itself

C.The act of rolling only

D.The sample space size

Question 3mcq

For equally likely outcomes, probability of an event is:

A.

\frac{\text{total outcomes}}{\text{favourable outcomes}}

B.Favourable outcomes plus total outcomes

C.Always

1

D.

\frac{\text{favourable outcomes}}{\text{total outcomes}}

Question 4mcq

A bag has

3

red and

5

blue balls. One ball is drawn at random. What is

P(\text{red})

?

A.

\frac{3}{5}

B.

\frac{8}{3}

C.

\frac{3}{8}

D.

\frac{5}{8}

Question 5mcq

What is the sample space when one coin is tossed?

A.

\{H\}

B.

\{H,T\}

C.

\{HH,HT,TH,TT\}

D.

\{1,2,3,4,5,6\}

Question 6mcq

Which sample space matches rolling one standard die?

A.

\{1,2,3,4,5,6\}

B.

\{H,T\}

C.

\{0,1\}

D.

\{2,4,6\}

Simple Probability

Question 7mcq

A die is rolled once. What is the probability of getting a prime number?

A.

\frac{1}{3}

B.

\frac{2}{3}

C.

\frac{5}{6}

D.

\frac{1}{2}

Question 8mcq

A card is chosen from cards numbered

1

to

10

. What is the probability of choosing a multiple of

3

?

A.

\frac{7}{10}

B.

\frac{1}{10}

C.

\frac{3}{10}

D.

\frac{1}{3}

Question 9mcq

Which of these can be a probability?

A.

\frac{5}{3}

B.

0.75

C.

-0.2

D.

1.4

Question 10mcq

A student says

P(\text{getting }7\text{ on a die})=\frac{1}{6}

. What is wrong?

A.

7

is not an outcome on a standard die.

B.The denominator should be

7

.

C.Every event has probability

1/6

.

D.The die has no sample space.