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A micrоcоntrоller cаn execute only one commаnd аt a time. Two commands are received 5 microseconds apart. The execution time for the first command is independent of the second and can be modeled as an exponential random variable with a mean of 6 microseconds. The execution of the second command can similarly be modeled as an exponential random variable with a mean of 12 microseconds. Random variable, T, describe the amount of time from when the second command was received until the microcontroller finished executing all commands. a. Find the expect value of T. b. Find the variance of T.