Discrete random variable
Suppose that X is a discrete random variable for which E[X]=12 and Var[X]=25. Compute E[X(X-5)].
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The leading brand of dishwasher detergent has a 30% market share. A sample of 25 dishwasher detergent customers was taken. What is the probability that 10 or fewer customers chose the leading brand? Please give the answer to four decimal places.
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