# Very simple problem I'm having trouble with

• November 13th 2010, 02:50 PM
Brokensound723
Very simple problem I'm having trouble with
$f(x)=0.8x^2$ over the interval $0 \leq x \leq c$. Find c.

What do I do exactly..?
• November 13th 2010, 03:25 PM
Prove It
Am I correct in assuming that this is a probability density function?

If so, remember that probability density functions have an area of 1.
• November 13th 2010, 04:26 PM
mr fantastic
Quote:

Originally Posted by Brokensound723
$f(x)=0.8x^2$ over the interval $0 \leq x \leq c$. Find c.

What do I do exactly..?

Solve for c: $\displaystyle \int_0^c 0.8x^2 \, dx = 1$.