Recent content by kensaurus

So for example, if I have a random variable X, take it to be normally distributed. How do you find the expectation and variance of the random variable e^X in terms of μ and σ? Integrating the entire normal function with the f(x) is it?

oh my, I am slapping my head... i went to derive it through complex, exponential functions and other means... thanks a lot!

I got a question here, and I am stuck at understanding the step of the solution. Any help will be appreciated. http://img841.imageshack.us/img841/6589/40155869.jpg I would like to know how to get from the second to the third step, where the summation comes in. It looks like multiplication of...

yes it is brilliant indeed! found an exhaustive explanation here too :) http://uk.answers.yahoo.com/question/index?qid=20100609093348AAFVp5w

so it all comes down to integration? okay, thanks... btw, this was a question from mensa, so i think there should be a brilliant way to solve it -.-

i just realized that the equations can't be solved based on your equations. it still results in 2 equations and I AM UNABLE to find your third equation. any help please?

Its a question that I had from a friend in the past. I had tried solving it but to no avail. Have tried integration and stuff like that, but I think there is an easier way to solve this question. Question -> Square of 7cm, find the shaded area...

dont understand what is Ibrits talking about... too complex -.-" What do you mean by kinetic energy is an operator acting on a wavefunction" and "wavefunction is a growing or (usually) decaying, instead of oscillating"?