Understanding Probability: Scale, Models & Predictions (Grade 7)
Free printable Grade 7 probability worksheet: the 0-1 likelihood scale, probabilities and complements as fractions, and predictions from probability models.
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Grade 7 · Math worksheet
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Date
Math
Understanding Probability: Scale, Models & Predictions
Place each event on the probability scale, find each probability as a fraction in lowest terms, and use and compare probability models.
- 1.A bag holds 4 red and 5 blue marbles. One marble is picked without looking. Picking a red marble is: certain, likely, an even chance, unlikely, or impossible?
- 2.A bag holds 9 red and 3 blue marbles. One marble is picked without looking. Picking a green marble is: certain, likely, an even chance, unlikely, or impossible?
- 3.A bag holds 5 red and 4 blue marbles. One marble is picked without looking. Picking a red marble is: certain, likely, an even chance, unlikely, or impossible?
- 4.A bag holds 2 red and 2 blue marbles. One marble is picked without looking. Picking a red marble is: certain, likely, an even chance, unlikely, or impossible?
- 5.A bag holds 5 red and 2 blue marbles. One marble is picked without looking. Picking a red or blue marble is: certain, likely, an even chance, unlikely, or impossible?
- 6.A spinner has 12 equal sections and 5 of them show a star. What is the probability the spinner lands on a star? Write the fraction in lowest terms.
- 7.A spinner has 12 equal sections and 2 of them show a star. What is the probability the spinner lands on a star? Write the fraction in lowest terms.
- 8.A spinner has 4 equal sections and 2 of them show a star. What is the probability the spinner lands on a star? Write the fraction in lowest terms.
- 9.A spinner has 4 equal sections and 1 of them are red. What is the probability the spinner does NOT land on red? Write the fraction in lowest terms.
- 10.A spinner has 4 equal sections and 2 of them are red. What is the probability the spinner does NOT land on red? Write the fraction in lowest terms.
- 11.A spinner has 4 equal sections and 1 of them show a star. If you spin it 12 times, about how many times do you expect a star?
- 12.A spinner has 10 equal sections and 2 of them show a star. If you spin it 40 times, about how many times do you expect a star?
- 13.A spinner has 5 equal sections and 4 of them show a star. If you spin it 25 times, about how many times do you expect a star?
- 14.A bottle cap landed face up 7 times in 28 tosses. Estimate the probability of landing face up as a fraction in lowest terms.
- 15.A bottle cap landed face up 24 times in 64 tosses. Estimate the probability of landing face up as a fraction in lowest terms.
- 16.A spinner has 4 equal sections and 3 show a star. The model predicts 18 stars in 24 spins, but an experiment produced 21. Is the observed frequency higher or lower than predicted, by how many, and give one possible reason for the difference?
- 17.A spinner has 5 equal sections and 1 show a star. The model predicts 9 stars in 45 spins, but an experiment produced 7. Is the observed frequency higher or lower than predicted, by how many, and give one possible reason for the difference?
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