What is the variance of the time it takes a technician to fix a computer problem?
A continuous random variable X has the probability density function: f(x)= 2 $e ^ { - 2 x }$ ,$x \geq$ 0

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The Answer of What is the variance of the time it takes a technician to fix a computer problem?
A continuous random variable X has the probability density function: f(x)= 2 $e ^ { - 2 x }$ ,$x \geq$ 0

What Is the Variance of the Time It Takes a Technician