# Joint probability mass functions help

• Sep 27th 2009, 02:58 PM
jlucas285
Joint probability mass functions help
Here's the pmf:
http://www.mathhelpforum.com/math-he...15743581-1.gif

(a) Verify that this is a legitimate joint pmf.
(b) Compute the marginal probability mass functions.
(c) Assume that n = 5 and compute P(X <= 3; Y <= 2)

i have no idea how to do this.
• Sep 27th 2009, 05:23 PM
CUEngineering
You should not post the entire problem onto this forum and ask someone else to solve it for you. Please do not answer the problem. This is a homework assignment and this student has violated Cornell University's Academic Code.
• Sep 28th 2009, 05:32 AM
mr fantastic
Quote:

Originally Posted by CUEngineering
You should not post the entire problem onto this forum and ask someone else to solve it for you. Please do not answer the problem. This is a homework assignment and this student has violated Cornell University's Academic Code.

Any post that a member is concerned about should be reported to a Moderator using the Report Post tool (the small triangle found in top right cornell of post).