Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**Identity****Member**- Registered: 2007-04-18
- Posts: 934

There is the pdf

and

. You need to find .I used two methods but they come up with difference results:

**1.**

The cdf

So

Note that I used the formula

**2.**

Using the formula

*Last edited by Identity (2009-09-01 18:46:47)*

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**juriguen****Member**- Registered: 2009-07-05
- Posts: 59

Hi!

You have to differentiate in order to obtain the pdf out of the cdf!

I think then they results match!

Jose

Make everything as simple as possible, but not simpler. -- Albert Einstein

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**Identity****Member**- Registered: 2007-04-18
- Posts: 934

Thanks juiguen, I just realised I got the formula for integration wrong:

*Last edited by Identity (2009-09-01 19:10:05)*

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**juriguen****Member**- Registered: 2009-07-05
- Posts: 59

Sure!

I actually hadn't realized how you had used that formula, and not I see it, so go for both

Jose

Make everything as simple as possible, but not simpler. -- Albert Einstein

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