Finding the cdf

**cirrus74** · April 23rd 2008, 08:41 PM

Find the expression for the cdf $F_x(x)$

We were actually given the solutions:

I understand the first part, concerning where x<0 but I don't understand when $x\geq 0$ ; why do we take the limits and equation from when x<0 + the limits and equation for $x\geq 0$

Please explain this to me. Thanks.

**mr fantastic** · April 23rd 2008, 09:20 PM

Originally Posted by cirrus74

Find the expression for the cdf $F_x(x)$

We were actually given the solutions:

I understand the first part, concerning where x<0 but I don't understand when $x\geq 0$ ; why do we take the limits and equation from when x<0 + the limits and equation for $x\geq 0$

Please explain this to me. Thanks.

If x > 0 then $F_X (x) = \Pr(X < x) = \int_{-\infty}^{0} f(x) \, dx + \int_{0}^{x} f(x) \, dx = .....$

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