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Year 8 maths · X.10 · Probability

Predict the number of times an event happens

Multiply the probability by the number of trials.

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  1. In 40 trials, heads came up 31 times. Using this result, how many times would you expect heads in 400 trials? (A number; it may be a decimal.)

    Answer: 310

  2. In 20 trials, a six came up 9 times. Using this result, how many times would you expect a six in 80 trials? (A number; it may be a decimal.)

    Answer: 36

  3. In 50 trials, a red spin came up 32 times. Using this result, how many times would you expect a red spin in 150 trials? (A number; it may be a decimal.)

    Answer: 96

Tip: Multiply the probability by the number of trials.

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