The time t (in minutes) that a customer spends at a check-out counter is believed to follow the exponential distribution. It was observed that 20% of the customers spend more than 3 minutes at the check-out counter. What is the probability that an incoming clerk will spend at most 2 minutes at the check-out counter?
Added by Patricia G.
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Given: Probability of T > 3 = 0.20 This implies e^(-3λ) = 0.20 Solving for λ, we get λ = 0.5365 Show more…
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