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wrong section

openstudy has a stats section?

could u do part a) ?

yeah

at the top it will say "Find More Subjects"

yeah, I know part a. It's legitimate because the total probability is equal to 1.

good, thats correct.
where r u stuck ?

Yeah its at the very bottom if you click on "Find More Subjects" at the top :))

oh, whoops. i didn't see that before. i'll go there next time.

mean is 0.2 ?
which formula did u use ?

total is 1, divided by 5, .2? did i do that wrong?

yes...
Mean = \(\sum xP(x)\)
so, it will be
mean = 0.2*4 + 0.25*3 + ......

oooh. okay. one sec. let me calculate that. :P

2.25?

don't u have answers to verify ?

yeah, even i get 2.25

nope. answers are given upon completion. :P

but thanks, I think I got it now. Wrong formula. :P

and u know formula for sd ?

yeah, got that. i compared that with a friend, and she got the same answer. it was just the mean.

ok, good :)