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Math Help - Probability equations

  1. #1
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    Probability equations

    I have to solve the following question:

    1, What is the probability of rain on any given working day (Mon-Fri) given that that probility from records suggest 30%.

    i, the probability of no rain on 3 consecutive working days

    ii, the probaility that there will be rain on at least 1 of 4 consecutive days.


    how is this calculated and what is the equation for doing so? Please be simple and detailed in the response as I'm picking this stuff up as I go along.

    Many thanks in advance.

    Colin
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  2. #2
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    Re: Probability equations

    Quote Originally Posted by colinb0 View Post
    I have to solve the following question:
    1, What is the probability of rain on any given working day (Mon-Fri) given that that probility from records suggest 30%.
    i, the probability of no rain on 3 consecutive working days
    ii, the probaility that there will be rain on at least 1 of 4 consecutive days.
    ii) 1-(0.7)^4 WHY?

    What is the answer to i. ?
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