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hi, i think this can be solved by recalling what correlation is, it is actually the square root of the "R squared"..and R squared is calculated as "Explained sum of squares divided by total sum of squares". In the problem: Total sum of squares would have to be SD(Y)^2 or 0.0676 Unexplained...

Hi, We subtract the joint probability to prevent double counting of events/probabilities. Using a simple example, say there are 2 classes, History and Science, if there are 40 students in History and 50 students in Science and it turns out that there are 10 students who are taking both...