2. The time in minutes) required for technicians to perform a specific task is believed to follow an exponential distrib
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2. The time in minutes) required for technicians to perform a specific task is believed to follow an exponential distribution with probability density function f(t) = 0.2e-0.2 if t > 0 0 if t < 0 (a) What is the mean time required by technicians to perform the task and its variance? (3 marks] (b) Calculate the probability that a technician can complete the task in less than 7 minutes. [7 marks]