MathematicsEasy75×since 2002Q4887Let X be a random variable having binomial distribution B(7, p). If P(X = 3) = 5P(x = 4), then the sum of the mean and the variance of X is :A10516{105 \over {16}}16105B716{7\over {16}}167C7736{77\over {36}}3677D4916{49\over {16}}1649Check answerSkip