4. A sequence of uniformly distributed random variables are presented by Xi where i = 1 … 50 on interval [0, 20] and a resultant random variable is created from them as X = (1/50)∑Xi . Another sequence of exponentially distributed random variable are presented by Yj where j = 1… 40 with parameter λ = 0.2, and a resultant variable is created from them as Y = (1/40)∑Yj . Now if Z = X + Y, find P{Z < 16}.
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