Let \( x \) be a random variable having binomial distribution \( B(7, p) \). If \( \mathrm{P}(X=... VIDEO
Let \( x \) be a random variable having binomial distribution \( B(7, p) \). If \( \mathrm{P}(X=3)=5 P(x=4) \), then the sum of the mean and the variance of \( X \) is
(a) \( \frac{105}{16} \)
(b) \( \frac{7}{16} \)
(c) \( \frac{77}{36} \)
(d) \( \frac{49}{16} \)
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