Worksheet: Probability of Simple Event

In this worksheet, we will practice finding the probability of a simple event and write it as a fraction.

Q1:

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 7 2 2
  • B 7 2 9
  • C 1 5 2 2
  • D 7 1 5

Q2:

What is the probability of rolling a number smaller than 2 on a regular dice?

  • A 1 2
  • B 2 3
  • C 1 6
  • D 1 3
  • E 5 6

Q3:

Given that the probability of an event occurring is 0.87, what is the probability of the event not occurring?

Q4:

In a class, the probability that a student chosen at random is a girl is 0.34. What is the probability that a student chosen at random is NOT a girl?

Q5:

Given that the probability of a person being selected for a job is 27%, what is the probability of that person NOT being selected?

Q6:

A spinner has 10 equal sections labeled from 1 to 10. Determine the probability of the pointer landing on 4 or 7.

  • A 9 1 0
  • B 4 5
  • C 2 9
  • D 1 1 0
  • E 1 5

Q7:

A box contains 7 white balls, 3 black balls, and 8 red balls. What is the probability that a ball drawn at random is black?

  • A 7 1 8
  • B 4 9
  • C 5 6
  • D 1 1 1 8
  • E 1 6

Q8:

If an event has a 42% chance of occurring, what is the probability that it does not occur?

Q9:

Given that the probability a student passes their exams is 38, what is the probability a student fails?

  • A 1 1 8
  • B 5 1 1
  • C 8 1 1
  • D 3 1 1
  • E 5 8

Q10:

The probability that an event occurs is 0.9. What is the probability that the event does not occur?

Q11:

Next week’s forecast predicts that there is a 74% chance that it will rain. Describe the complementary event and its probability.

  • AThere is a 74% chance that it will not rain.
  • BThere is a 74% chance that it will rain.
  • CThere is a 26% chance that it will rain.
  • DThere is a 24% chance that it will not rain.
  • EThere is a 26% chance that it will not rain.

Q12:

If I roll a regular six-sided die, what is the probability that the score is an odd, prime number?

  • A 1 3
  • B 1 2
  • C 2 3
  • D 3 4

Q13:

If I roll a regular six-sided die, what is the probability that the score is divisible by 3?

  • A 1 3
  • B 1 2
  • C1
  • D 2 3

Q14:

State whether it is impossible, certain, or possible for it to rain gold.

  • Aimpossible
  • Bcertain
  • Cpossible

Q15:

If a coin is flipped once, what is the probability of getting a tail?

  • A 3 4
  • B 2 3
  • C 1 4
  • D 1 2

Q16:

A card is selected at random from a pack of 16 cards which are numbered 1 to 16. What is the probability of the selected card having an even number?

  • A 1 2
  • B 7 1 6
  • C 9 1 6
  • D 3 8
  • E 5 8

Q17:

Given that the probability of an event occurring is 12, what is the probability of the event not occurring?

  • A 1 2
  • B 2 3
  • C 1 3
  • D1

Q18:

A class contains 6 boys and 21 girls. If a pupil is selected at random, what is the probability they are a girl?

  • A 2 2 2 7
  • B 3 4
  • C 2 0 2 7
  • D 2 9
  • E 7 9

Q19:

If the probability of an event occurring is 1336, what is the probability that it does not occur?

  • A 2 3 3 6
  • B 1 3 7 2
  • C 1 3 3 6
  • D 2 3 7 2

Q20:

If a regular six-sided die is rolled twice, what is the probability of getting a 4 on the first roll?

  • A 1 3
  • B 1 1 2
  • C 1 9
  • D 1 6

Q21:

If a regular six-sided die is rolled twice, what is the probability of getting a 3 on the first roll?

  • A 1 9
  • B 1 3
  • C 1 1 2
  • D 1 6

Q22:

If I roll a regular six-sided die, what is the probability that the score is an odd number?

  • A 1 3
  • B 1 4
  • C 1 2
  • D 1 6

Q23:

If I roll a regular six-sided die, what is the probability that the score is 5?

  • A 1 2
  • B 1 4
  • C 1 6
  • D 1 3

Q24:

If I roll a regular six-sided die, what is the probability that the score is 6?

  • A 1 6
  • B 1 3
  • C 1 4
  • D 1 2

Q25:

If I roll a regular six-sided die, what is the probability that the score is 3?

  • A 1 2
  • B 1 3
  • C 1 4
  • D 1 6

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