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Math Help - probability

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    Post probability

    A police department needs new tires for its patrol cars. the probabilities that it will be any brands A,B,C or D are 0.24, 0.18, 0.28 & 0.30 resply. find the probability that it will be any of the brands A or C
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    Quote Originally Posted by Zandra View Post
    A police department needs new tires for its patrol cars. the probabilities that it will be any brands A,B,C or D are 0.24, 0.18, 0.28 & 0.30 resply. find the probability that it will be any of the brands A or C
    Hi Zandra,

    You can use the following to figure it out:
    Pr(A \text{ or } B)=Pr(A)+Pr(B)-Pr(A \text{ and } B)
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    Quote Originally Posted by Zandra View Post
    A police department needs new tires for its patrol cars. the probabilities that it will be any brands A,B,C or D are 0.24, 0.18, 0.28 & 0.30 resply. find the probability that it will be any of the brands A or C
    0.24 + 0.28 = ....
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    Quote Originally Posted by Zandra View Post
    A police department needs new tires for its patrol cars. the probabilities that it will be any brands A,B,C or D are 0.24, 0.18, 0.28 & 0.30 resply. find the probability that it will be any of the brands A or C
    Just add the probablility of C and A

    That is 0.28+0.24
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    THANKYOU
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