Which of the following is a valid probability distribution for a discrete random variable? Check all that apply.
A. -1/2,-1/3,-1/4,-1/5,137/60
B. 1/6/,1/5,1/4,1/3
C.1/12.1/12.1/12.1/12,1/6,1/12,1/12, 1/12,1/12,1/6
D.1/5,1/5,1/5,1/5,1/5
E.1/2,1/4,1/8,1/16,1/32,1/64,1/128, 1/128

Question

Which of the following is a valid probability distribution for a discrete random variable? Check all that apply. 
A. -1/2,-1/3,-1/4,-1/5,137/60 
B. 1/6/,1/5,1/4,1/3 
C.1/12.1/12.1/12.1/12,1/6,1/12,1/12, 1/12,1/12,1/6 
D.1/5,1/5,1/5,1/5,1/5 
E.1/2,1/4,1/8,1/16,1/32,1/64,1/128, 1/128

anonymous · Answer

how would you find this out?

zarkon · Answer

all numbers need to be positive and they have to sum to 1

anonymous · Answer

so it wouldnt be  A

zarkon · Answer

correct A is not a valid distribution

anonymous · Answer

i dont know how i can find if the add up to one?

anonymous · Answer

you just add all the numbers together in that row?

anonymous · Answer

i hope this helps http://www.mathportal.org/calculators.php

zarkon · Answer

yes

anonymous · Answer

okay, hmmm hold on