A random variable X has a distribution function 0. 2/16, I- 7/4. 2<1S11/4, 1. F(z) = 1> 11/4. Find its 1) distribution density f(r), make plots of both F(r) and f(r), 2) mathematical expectation, variance, and standard deviation, 3) P{X € (1,1.5).

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