[University Calculus 1] Converting a function into a probability density function

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I am given the function y=-.026x³ 1.6578x² -42.803x 754.4.

I have already found that y=0 at x=40.8488

Using that information, I need to convert this into a probability density function over the interval 0≤x≤40.8488

I know that 040.8488 ∫-.026x³ 1.6578x² -42.803x 754.4 does not equal one, but that is needed in order for the function to be a probability density function. How do I convert this function into a probability density function?

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