[BruceZ]

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Amazing.

Thank you so much.

I will try not to go hog-wild but I probably will have a couple more questions this week as I continue to struggle with this assignment [img]/images/graemlins/crazy.gif[/img]

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Like alThor says, you only have to compute the variance for a single group, or even a single individual, and then use the fact that the variance of a sum is the sum of the variances. Same for the expected value, except if you use individuals, you have to remember to add the 10 mandatory group tests. A group can either get 1 test or 11 tests. An individual can get 0 test or 1 test. That makes the computation of expected value and variance so simple that you should be able to do the whole thing in your head.