The amount of time required to serve a customer at a bank has an exponential density function with mean 3 minutes / Recall an exponential probability density function had the form f(x) = ke-kx, x 20, where K = I μ means E(X), the expected value Find the probability that a customer is served in less than 2 minutes. Δ Δ Δ Δ Δ Δ Δ Δ Δ Δ Δ Δ AAA 出

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