The rating stress, X, of a Viking hammer, has the following cumulative distribution function F: F(x) = 0 for x < 0 and F(x)= for 0 ≤ x ≤ 4 and F(x) = 1 for x > 4 a) what is the probability density function for X for 0 ≤ x ≤ 4? O f(x) = O f(x) = 2.x x² 16 Of(x) = 2x-8 ○ f(x) = O f(x) = b) What is the probability that X > 2.5? c) What is the probability X < 2.5?

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