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Mar 7, 2019 at 16:11 comment added user44143 I don't think there's a closed-form answer. The best I can see is that if you are willing to use normal approximations for R_i and W_i, perhaps because R and W are large, then there is a formula for the expectation using erf.
Mar 7, 2019 at 13:49 history edited YCor CC BY-SA 4.0
insert "for" word to break "i,i", romanized min
Mar 7, 2019 at 13:46 history edited Matze CC BY-SA 4.0
added 90 characters in body
Mar 7, 2019 at 10:31 history asked Matze CC BY-SA 4.0