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Mathematical Methods for Physics and Engineering - Matematica.NET

Mathematical Methods for Physics and Engineering - Matematica.NET

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PROBABILITYf(x)2pF(x)1p12 p 12 3 4 5 6x1 2 3 4 5 6(a)(b)Figure 30.6 (a) A typical probability function <strong>for</strong> a discrete distribution, that<strong>for</strong> the biased die discussed earlier. Since the probabilities must sum to unitywe require p =2/13. (b) The cumulative probability function <strong>for</strong> the samediscrete distribution. (Note that a different scale has been used <strong>for</strong> (b).)Hence F(x) is a step function that has upward jumps of p i at x = x i , i =1, 2,...,n, <strong>and</strong> is constant between possible values of X. We may also calculatethe probability that X lies between two limits, l 1 <strong>and</strong> l 2 (l 1

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