In Exercises 1-8, determine which are probability density functions and justify your answer. 1g*over [4, 8] 1. f(x) = 2. f(x) = ; (2 – x) over [0, 2] %3D In (1 + In 2) 3. f(x) = 2* over 0, In 2 4. f(x) = x – 1 over [0, 1 + V3] 5. f(x) = 0 x<1 6. f(x) = { T(4 + x²) 0. 7. f(x) = 2 cos 2x over | 0, 8. f(x) = over (0, e ]

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