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# Coverting pdf to cdf

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1. When using the definite integration method to convert a pdf to cdf and you have 3 functions in the pdf how do you work out the constant for the middle one?

I know you put F(lower value of range)=0 and F(upper value of range)=1 but how would you know what to put for the middle function?

Thanks
2. (Original post by mp_x)
When using the definite integration method to convert a pdf to cdf and you have 3 functions in the pdf how do you work out the constant for the middle one?

I know you put F(lower value of range)=0 and F(upper value of range)=1 but how would you know what to put for the middle function?

Thanks
If you have the pdf just find integral of pdf from (-infinity) to upper value of the middle part then that gives you a value for F(upper value of middle part) which you can then use to find the constant.
3. (Original post by Zacken)
If you have the pdf just find integral of pdf from (-infinity) to upper value of the middle part then that gives you a value for F(upper value of middle part) which you can then use to find the constant.
I don't get what you mean
4. (Original post by mp_x)
I don't get what you mean
Say you have a PDF

Then to find and you can then use to find your constant of integration in your CDF.

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