a past exam question has the question in the below image. I am very stuck on how to do both parts. I know a valid pdf is greater than 0 for all x and the integral between -infinity and infinity is equal to 1. How would I prove that here? Also, any pointers on what to use to integrate part ii?
2026-03-26 04:31:42.1774499502
How to verify valid PDF and calculate E(X^4) base on E(X^2)
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