Which condition must a function f(x)f(x)f(x) satisfy to be a PDF on the interval [a,b][a, b][a,b]?
f(x)≥0f(x) \geq 0f(x)≥0 for all xxx
∫abf(x)dx=1\int_a^b f(x)dx = 1∫abf(x)dx=1
f(x)=1f(x) = 1f(x)=1 for all xxx
∫abf(x)dx=0\int_a^b f(x)dx = 0∫abf(x)dx=0