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Worksheet: Probability of Simple Event

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

Q2:

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

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

Q3:

Given that the probability a student passes their exams is 3 8 , what is the probability a student fails?

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

Q4:

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

Q5:

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

Q6:

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?

Q7:

Given that the probability of a person being selected for a job is 2 7 % , what is the probability of that person NOT being selected?

Q8:

Next week’s forecast predicts that there is a 7 4 % chance that it will rain. Describe the complementary event and its probability.

  • AThere is a 7 4 % chance that it will not rain.
  • BThere is a 2 6 % chance that it will rain.
  • CThere is a 7 4 % chance that it will rain.
  • DThere is a 2 6 % chance that it will not rain.
  • EThere is a 2 4 % chance that it will not rain.

Q9:

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

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

Q10:

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

  • A 2 3
  • B 1 2
  • C1
  • D 1 3

Q11:

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

Q12:

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

Q13:

If an event has a 4 2 % chance of occurring, what is the probability that it does not occur?

Q14:

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

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

Q15:

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

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

Q16:

What is the probability of rolling an even number greater than 0 on a fair die?

  • A 1 6
  • B0
  • C1
  • D 1 2

Q17:

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

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

Q18:

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

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

Q19:

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 3
  • D 1 6

Q20:

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

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

Q21:

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

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

Q22:

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

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

Q23:

If I roll a regular six-sided die, what is the probability that the score is 4?

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

Q24:

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

  • A 2 3
  • B 1 3
  • C0
  • D 1 2

Q25:

What is the probability of rolling a number which is divisible by 2 on a fair die?

  • A 2 3
  • B 1 3
  • C1
  • D 1 2