# Lesson Worksheet: Probability of Simple Events Mathematics

In this worksheet, we will practice finding the probability of a simple event.

Q1:

A class contains 6 boys and 21 girls. What is the probability of selecting a girl if a student is selected at random?

• A
• B
• C
• D
• E

Q2:

What is the probability of rolling an odd number on a fair die?

• A
• B0
• C
• D

Q3:

A bag contains 7 white marbles, 8 black marbles, and 7 red marbles. If a marble is chosen at random from the bag, what is the probability that it is white?

• A
• B
• C
• D

Q4:

What is the probability of selecting at random a prime number from the numbers 8, 9, 20, 19, 3, and 15?

• A
• B0
• C
• D1
• E

Q5:

A card is drawn from a deck of cards numbered from 1 to 37. What is the probability that the number on the card is even?

• A
• B
• C1
• D
• E

Q6:

The table shows the results of a survey that asked 30 students to vote for their favourite sport.

 Sport Number of Students Football Basketball Volleyball Swimming 12 9 3 6

What is the probability that a randomly selected student voted for basketball?

• A
• B
• C
• D

Q7:

A card is selected at random from a pack of 45 cards which are numbered 1 to 45. What is the probability that the selected card has a perfect square number?

• A
• B
• C
• D
• E

Q8:

A card is drawn from a deck of cards numbered 1 to 30. Find the probability of getting a card with a positive integer less than 20 on it.

• A
• B
• C
• D

Q9:

A bag contains 24 white balls and an unknown number of red balls. The probability of choosing at random a red ball is . How many balls are there in the bag?

Q10:

A bag contains an unknown number of marbles. There are 2 red marbles, some white marbles, and some black marbles. The probability of getting a white marble is , and the probability of getting a black marble is . Calculate the number of marbles in the bag.

This lesson includes 19 additional questions and 209 additional question variations for subscribers.