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Thread: Exponential Distribution

  1. #1
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    Exponential Distribution

    Hi

    The following question i don't understand why my answer is incorrect.
    X is an exponential rc, with mean 2. What is the Pr(X < 2.5)?
    My answer is
    $\displaystyle F(x) = 1$ - e^($\displaystyle \lambda x$)

    $\displaystyle \lambda = 2$ and x = 2.5

    so $\displaystyle 1 $ - e^(-2*2.5)

    P.S
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  2. #2
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    Re: Exponential Distribution

    Quote Originally Posted by Paymemoney View Post
    Hi

    The following question i don't understand why my answer is incorrect.
    X is an exponential rc, with mean 2. What is the Pr(X < 2.5)?
    My answer is
    $\displaystyle F(x) = 1$ - e^($\displaystyle \lambda x$) That should be minus lambda

    $\displaystyle \lambda = 2$ and x = 2.5

    so $\displaystyle 1 $ - e^(-2*2.5)

    P.S
    The mean is $\displaystyle 1 / \lambda$, so if the mean is 2, then lambda is...
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