Question: Which of the following could not be probability density functions for a continuous random variable? Explain. a. f (x) = .25 for 0 x

Which of the following could not be probability density functions for a continuous random variable? Explain.
a. f (x) = .25 for 0 ≤ x ≤ 1
b. f (x) = .25 for 0 ≤ x ≤ 4
c. f (x) = x for 0 ≤ x ≤ 2

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