Question

Let X be a random variable with the probability function f(x) = kx^2 for x = 2, 3, 4, 6.

(a) Find the appropriate value of k.
(b) Find the mean  and the variance.

Answer 1

discrete or continuous?

Answer 2

the random variable that is.

Answer 3

continuous

Answer 4

oh no wait this is discrete. Sorry.

Answer 5

yeah, i dont know why i asked. it gave discrete values (2, 3, 4, 6). my apologies.

Answer 6

hold on...

Answer 7

Part 1

Answer 8

Part 2

Answer 9

Alright I see what I did wrong there. I did part a right, but part b sort of messed me up. I know what to do now. Thanks for the help. :)

Answer 10

Not a problem. Is this for class or a professional exam?

Answer 11

It's suppose to be a class that relates with both mathematics and computer science.

Answer 12

Cool. Sounds like something from an actuary P/1 exam. Anyway, best of luck and take care.

Answer 13

Thanks and you too.