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let x1 denote the thickness of coin battery a and x2 denote the thickness of coin battery b. assume that the distribution of x1 is n(1, 0.0004) and the distribution of x2 is n(1.01, 0.0009). if a coin battery a and a coin battery b are selected at random, what is the probability that the thickness of coin battery a will exceed the thickness of coin battery b?