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Grade 7 maths · Y.4 · Compound events

Probability of heads in coin flips

List all equally likely outcomes of the flips. Probability = favourable ÷ total, as a fraction in lowest terms.

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  1. A fair coin is flipped 2 times. What is the probability of getting at least 2 heads? Write a fraction in lowest terms.

    Answer: 1/4

  2. A fair coin is flipped 6 times. What is the probability of getting at most 0 heads? Write a fraction in lowest terms.

    Answer: 1/64

  3. A fair coin is flipped 5 times. What is the probability of getting at most 4 heads? Write a fraction in lowest terms.

    Answer: 31/32

Tip: List all equally likely outcomes of the flips. Probability = favourable ÷ total, as a fraction in lowest terms.

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