3. Computer chips often contain surface imperfections. For a certain type of computer chips, the probability mass function of the number of defects X is presented in the following table. x 0 1 2 3 4 5 P(x) 0.28 0.23 0.18.15 0.13 0.03 a) Find P(X ≤2). b) Find P(X> 1). c) Find the mean number of defects, μ d) Find the variance of the number of defects, o²

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