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Expected number from a theoretical probability

Grade 7 math · Fieldbook Learning

Name ______________________ Date __________

Multiply the probability by the number of trials.

  1. The probability of a spinner landing on blue is 1/2. If it is spun 20 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  2. The probability of a spinner landing on blue is 3/5. If it is spun 15 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  3. The probability of a spinner landing on blue is 1/2. If it is spun 12 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  4. The probability of a spinner landing on blue is 5/10. If it is spun 70 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  5. The probability of a spinner landing on blue is 5/9. If it is spun 36 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  6. The probability of a spinner landing on blue is 10/12. If it is spun 120 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  7. The probability of a spinner landing on blue is 5/9. If it is spun 81 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  8. The probability of a spinner landing on blue is 1/5. If it is spun 30 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  9. The probability of a spinner landing on blue is 4/12. If it is spun 96 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  10. The probability of a spinner landing on blue is 3/6. If it is spun 24 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  11. The probability of a spinner landing on blue is 1/11. If it is spun 132 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  12. The probability of a spinner landing on blue is 8/9. If it is spun 54 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  13. The probability of a spinner landing on blue is 4/12. If it is spun 48 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  14. The probability of a spinner landing on blue is 8/14. If it is spun 98 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  15. The probability of a spinner landing on blue is 9/18. If it is spun 36 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  16. The probability of a spinner landing on blue is 4/16. If it is spun 192 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  17. The probability of a spinner landing on blue is 21/24. If it is spun 192 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  18. The probability of a spinner landing on blue is 15/22. If it is spun 220 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  19. The probability of a spinner landing on blue is 6/18. If it is spun 72 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
  20. The probability of a spinner landing on blue is 6/13. If it is spun 26 times, how many times would you expect it to land on blue? (A number; it may be a decimal.)
More free practice: fieldbooklearning.com/ca/practice/grade-7/expected-number-from-a-theoretical-probability/

Answer key: Expected number from a theoretical probability

  1. 10
  2. 9
  3. 6
  4. 35
  5. 20
  6. 100
  7. 45
  8. 6
  9. 32
  10. 12
  11. 12
  12. 48
  13. 16
  14. 56
  15. 18
  16. 48
  17. 168
  18. 150
  19. 24
  20. 12