求教一道统计学数学题
afaircoinistossedtwice.letXrepresentthenumberofheadsobtainedonthefirsttossandYrepresentthetotalnumberofheadsobtainintwotosses.
a:derivethebirvariateprobabilitydistributionforthevariablesXandY.
b:computecov(X,Y)
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