Value of the new score
A sample of n 8 scores has a mean of M 12. One new score is added to the sample and the new mean is found to be M 13. What is the value of the new score?
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Let X and Y be continuous random variables with joint probability density f (x, y) = (1+4xy)/2, for 0 < x < 1 and 0 < y < 1 f (x, y) = 0, otherwise. Compute the marginal density of X & Y.
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