# Question: Which of the following could not be probability density functions

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

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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