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The probability distribution of X, the number of imperfections per 10 meters of a synthetic fabric in continuous rolls of uniform width, is given in Exercise 3.13 on page 92 as

x	0	1	2	3	4
f(x)	0.41	0.37	0.16	0.05	0.01

Find the average number of imperfections per 10 meters of this fabric.

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