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## Homework Statement

here's a problem from my assignment

let integral p(x)dx=Ae^-(x/a) dx...........(1)

find value of A, that makes integral p(x)dx=1;

and

find mean x so that integral x*p(x)dx=a.........2)

## Homework Equations

now

to solve the first one i found out A to be (-1/a*e^(x/a))

but when i am integrating the two i can not find that value 1........plz tell me if my value of A is ok or not........

and for the second problem how can i integrate those three components all together?

what is the formula, plz notify here......

thanks in advance

## The Attempt at a Solution

A to be (-1/a*e^(x/a))