I'm not sure if this actually Advanced, but it is from a 3000-level University course. My apologies if I am misposting.
Ok... So that seems pretty clear to me that p = .4 (based on the logic that q=.6 = 1-p).A random variable X has the probability mass function
, for x = 1, 2 , 3, …
Find p, the mean and the variance of X.
But I have no idea where to go from here. If I go to take the mean and variance, according to the text and notes, the formulae I'd be using are:
and
Maybe my calculus-fu has weakened (it's been a long time), but I can't for the life of me figure out how to do those sums since they don't appear to resemble any of the series I studied in Calc II...
If anyone could give me a pointer, or tell me where I did something wrong, I'd appreciate it. Thanks...
I was just putting that there to illustrate my thought process in case that's where my error was, but I'll keep it in mind. Thank you.
I'm a little lost there. Is that a rewriting of the function I had, or was mine wrong?
I assume it'll be summed the same way you described for the mean above?
Thanks again.