If the probability that it will rain tomorrow is 0.30, what is the probability that it will not rain tomorrow?

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If the probability that it will rain tomorrow is 0.30, what is the probability that it will not rain tomorrow?

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    2021-11-25T22:24:06+00:00

    p = probability it rains tomorrow
    q = probability it does not rain tomorrow

    Since it either rains or it doesn’t rain, this means p+q = 1
    Think of 1 as 100% indicating total certainty

    Solve for q to get
    q = 1-p
    by subtracting p from both sides

    We’re given p = 0.30 which is the probability of it raining, so,
    q = 1-p
    q = 1-0.30
    q = 0.70

    Answer: 0.70

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