Each of 150 newly manufactured items is examined and the number of scratches per item is recorded (the items are supposed to be free of scratches), yielding the following data: Number of scratches per item 1 3 4 6 7 Observed frequency 18 37 42 30 13 7 2 1 Let X be the number of scratches on a randomly chosen item, and assume that X has a Poisson distribution with parameter u. Knowing the E(X) = µ for the Poisson random variable X, then E(X) would be: a b d.

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