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?

  • A2227
  • B34
  • C2027
  • D29
  • E79

Q2:

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

  • A13
  • B0
  • C12
  • D23

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?

  • A722
  • B729
  • C1522
  • D715

Q4:

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

  • A13
  • B0
  • C110
  • D1
  • E12

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?

  • A1837
  • B1937
  • C1
  • D1237
  • E1737

Q6:

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

SportFootballBasketballVolleyballSwimming
Number of Students12936

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

  • A310
  • B110
  • C25
  • D15

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?

  • A2345
  • B19
  • C1145
  • D2245
  • E215

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.

  • A13
  • B1930
  • C23
  • D710

Q9:

A bag contains 24 white balls and an unknown number of red balls. The probability of choosing at random a red ball is 731. 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 13, and the probability of getting a black marble is 12. Calculate the number of marbles in the bag.

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

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