document.write( "Question 393605: An exponential distribution has a mean of 0.5 .Find probability
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Algebra.Com's Answer #279320 by robertb(5830)\"\" \"About 
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The mean \"1%2Falpha\" of the exponential function is 1/2, and hence \"alpha+=+2\". The density function becomes \"f%28x%29+=+alpha%2Ae%5E%28-alpha%2Ax%29+=+2e%5E%28-2x%29\" for \"x%3E=0\", and f(x) = 0 otherwise.\r
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