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Class 7 maths · X.9 · Probability

Experimental probability from trials

Probability = number of times it happened ÷ number of trials. Write a fraction in lowest terms.

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  1. In 40 trials, a six came up 39 times. What is the experimental probability of a six? Write a fraction in lowest terms.

    Answer: 39/40

  2. In 100 trials, a red spin came up 63 times. What is the experimental probability of a red spin? Write a fraction in lowest terms.

    Answer: 63/100

  3. In 25 trials, heads came up 8 times. What is the experimental probability of heads? Write a fraction in lowest terms.

    Answer: 8/25

Tip: Probability = number of times it happened ÷ number of trials. Write a fraction in lowest terms.

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