I'm still having a bit of trouble trying to understand this stuff.
Source: Probability and Statistical Inferences, 7E, by Hoggs and TanisLet a chip be taken at random from a bowl that contains six white chips, three red chips, and one blue chip. Let the random variable if the outcome is a white chip; let if the outcome is a red chip; and left if the outcome is a blue chip.
(a) Find the p.m.f. of
I understand that , , and .
My issue here is determining a proper value for the numerator of my . My stab at this would be to say that the p.m.f. has the form of , where is the part I can't figure out.
I see a pattern though:
The difference between the first two terms is 3, and the last two terms is 2. Other than that, I'm at a standstill.
I'd appreciate any input!
w00t!!! my 9th post!!