Question: The p.d.f. of a random variable X is f(x) = l - x/2 for 0 x 2. Find the variance and standard deviation

The p.d.f. of a random variable X is f(x) = l - x/2 for 0 ≤ x ≤ 2.
Find the variance and standard deviation of a continuous random variable with the given p.d.f.

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