Determine the mean and the variance of w find d1d2d3 and d4

Let W be x2(12)

(a) Determine the mean and the variance of W

(b) Find d1,d2,d3, and d4 so that p(W > d1) = 0.05, P( W > d2) = 0.99 P(W > d3) = 0.005 and P(W < d4) =0.025. Use tables

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