二项分布概率公式简介：Ji Si is a thin scholar in his fifties, with gray beard and hair. He is wearing a shabby but spotless Confucian shirt. He is sitting next to Luo Rucai, twirling his beard and squinting his eyes, not knowing what he is thinking. .
Ji Si is a thin scholar in his fifties, with gray beard and hair. He is wearing a shabby but spotless Confucian shirt. He is sitting next to Luo Rucai, twirling his beard and squinting his eyes, not knowing what he is thinking. .
