Select all of the following of marginal pmfs and pdfs that are TRUE. O The only information you need to compute a marginal pmf is the original joint pmf. O You cannot use a marginal pdf to find the...

Extracted text: Select all of the following of marginal pmfs and pdfs that are TRUE. O The only information you need to compute a marginal pmf is the original joint pmf. O You cannot use a marginal pdf to find the expectation of a random variable. O The sum or integral over an entire marginal pmf or pdf must be equal to 1. O You can generate the joint pdf of two random variables if you have both marginal pdfs. The sum of all of the probabilities in a joint pmf with 2 random variables must add up to 2. Let f(x,y) be the joint pmf of rolling 2 identical, standard 6 sided dice. What is Pr(X <= 2,="" y="">=4)? Enter your answer with 4 decimal places.