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How to map over non-Null values in a list [duplicate]

Possible Duplicate: Selectively Mapping over elements in a List I have a list of distributions and a list of samples. I'm trying to calculate probabilities of some record being within one ...
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Expectation over a list with nested-mapped expressions

I need expected values of a list where the random variable to take expectations over should be an input into expressions defined earlier. I suspect Set[] and SetDelayed[] tripped me. (Or Map and ...