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Grade 7 math · X.7 · Probability

Probability of the opposite event: percents

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

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  1. There is a 33% chance of rain tomorrow. What is the chance that it does not rain? Write the percent only.

    Answer: 67

  2. There is a 5% chance of rain tomorrow. What is the chance that it does not rain? Write the percent only.

    Answer: 95

  3. There is a 2% chance of rain tomorrow. What is the chance that it does not rain? Write the percent only.

    Answer: 98

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

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