Question

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

A. 1.0
B. 0.02, 0.03, 0.21, 0.16, 0.04, 0.12, 0.18, 0.05, 0.16, 0.05
C. 0.18, 0.12, 0.03, -0.08, 0.21, 0.04, -0.34, 0.05, 0.16, 0.25, 0.21, 0.17
D. 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1, 0.1
E. 0.21, 0.16, 0.05, 0.04, 0.03, 0.12, 0.21, 0.18

Answer 1

the ones where the numbers add exactly to 1

Answer 2

a boring calculator exercise, but that is what you have to do
add the numbers
if the sum is 1 the answer is yes, and if the sum is not 1 the answer is no
but you can ignore C because all the numbers must be positive, and C includes a couple negative numbers

Answer 3

D and E add up to one. Would A just automatically make it correct?

Answer 4

thanks by the way :) @satellite73