Question

Let X represent the number of errors per 100 lines of source code in a software...

Let X represent the number of errors per 100 lines of source code in a software application. Suppose X has the probability model: ?[? = ?] = { 0.01 ? = 2 0.25 ? = 3 0.40 ? = 4 0.30 ? = 5 0.04 ? = 6 Calculate the variance of X .

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