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Grade 7 math · X.6 · Probability

Probability of the opposite event: decimals

The probability of an event and the probability that it does not happen add up to 1 (or 100%).

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  1. The probability that it rains tomorrow is 0.22. What is the probability that it does not rain? Write a decimal.

    Answer: 0.78

  2. The probability that it rains tomorrow is 0.21. What is the probability that it does not rain? Write a decimal.

    Answer: 0.79

  3. The probability that it rains tomorrow is 0.41. What is the probability that it does not rain? Write a decimal.

    Answer: 0.59

Tip: The probability of an event and the probability that it does not happen add up to 1 (or 100%).

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