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The time between two telephone calls that arrive at a Police station is often modeled as an Exponential random variable. The time between two telephone calls is known from historical data to have an average amount of time equal to 4 minutes. What is the probability that the time between two calls is less than 2 minutes? a) 0.4152 b) 0.1296 () 0.2458 d) 0.3934 Bos birak