[10000ダウンロード済み√] ^IPbg Xk[s[ L 293332
Links with this icon indicate that you are leaving the CDC website The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a nonfederal website Linking to a nonfederal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the websiteD e b g b q _ k d h _ \ _ ^ _ g b _ l y ` _ e h c h k l j h c j _ k i b j Z l h j g h c b g n _ d p b b i j b i h ^ h a j _ g b b g Z g h \ m x d h j h g Z \ b j m kX∞ k=0 (1−p)kp = p X∞ k=0 (1−p)k = p 1 1−(1−p) = p 1 p = 1 This uses the geometric series, the fact that P pk = 1/(1−p), if p is between 0 and 1 Now let's think about the mean EX = X∞ k=0 k(1−p)kp = p X∞ k=1 k(1−p)k = p 1 p2 = 1 p Similarly (but more involvedly) the variance is (1−p)/p2 41 Negative binomial ^IPbg Xk[s[ L