This is a Gamma Distrib with alpha = 3.5 and beta = 1.5
The book says the solution is 228.4 though. I don't understand why I am wrong.
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You seem a little confused on some notation and some algebra.
1) ? Too much denominatoring going on in there. Try .
2) Just a couple of misconstrued items. You should get:
This is a tough place to be having an algebra breakdown. Be more careful.