4.1 The probability distribution of X, the number of imperfections per 10 meters of a synthetic fabric in con- tinuous rolls of uniform width, is given in Exercise 3.13 on page 92 as 1 2 3 4 f(x) Find the average number of imperfections per 10 me- ters of this fabric. 0.41 0.37 0.16 0.05 0.01

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