Probability Density Function

Question 1

what are the three conditions of a pdf

Answer 1

f(x) >= 0
integ from infinity to -infinity, of f(x) dx = 1
F(x) = integ from infinity to -infinity, of f(s) ds

Question 2

differences between PMF and PDF

Answer 2

pdf is not a probability, so can be less than 1

pmf is a probability so must equal exactly 1

Question 3

what is pmf

Answer 3

probability mass function