Which of the following is a valid probability distribution for a discrete random variable? Check all that apply.

A. 0.21, 0.16, -.08, 0.05, 0.04, 0.03, -0.24, 0.12, 0.21, 0.18, 0.32
B. 0.18, 0.12, 0.03, 0.08, 0.21, 0.04, 0.05, 0.16, 0.13
C. 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1
D. 0.1, 0.2, 0.3, 0.4
E. 1.0

I think it is B, D, and E because A has negatives and C adds up to 1.1. Can it be over one? Or does it have to add up to exactly 1? HELP!

Question

Which of the following is a valid probability distribution for a discrete random variable? Check all that apply.

 		A.	0.21, 0.16, -.08, 0.05, 0.04, 0.03, -0.24, 0.12, 0.21, 0.18, 0.32
 		B.	0.18, 0.12, 0.03, 0.08, 0.21, 0.04, 0.05, 0.16, 0.13
 		C.	0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1
 		D.	0.1, 0.2, 0.3, 0.4
 		E.	1.0

I think it is B, D, and E because A has negatives and C adds up to 1.1. Can it be over one? Or does it have to add up to exactly 1? HELP!

anonymous · Answer

@amistre64 @jim_thompson5910 @dancemeclean ANYONE!?

anonymous · Answer

@smokeydabear

amistre64 · Answer

a valid probability distribution always adds up to 1 entotal

anonymous · Answer

I don't think I'm qualified for this, let amistre help you ^^

amistre64 · Answer

and yes, all the inner probs have to be between 0 and 1 as well, so that negative is out

anonymous · Answer

So the answer would be B, D, and E?

amistre64 · Answer

well, im not adding up B .... but if your sure its a sum equal to 1, ill trust you

anonymous · Answer

It was correct!! Thank you!!! :)