A smart phone application maker has compiled the following probability mass function table for the random variable, X, of how many stars a user gives an application in a review. A user may give 1, 2, 3, 4, or 5 stars in a review of an application (1 star is poor review and 5 star is great review). X P(X=x)=f(x) 1 0.10 2 0.25 3 0.40 4 0.15 5 0.10

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