【单选题】设X 为随机变量,E(X)=2,D(X)=5,则 为 ( )
【单选题】The majority of people around here are ____eople.
【判断题】P eople thought of a dolescence hundreds of years ago .
【单选题】There were a lot p eople in the lecture hall than I expected .
【判断题】The author holds that p eople are not interested in teaching chimpanzees to talk is probably that they will ruin human ’ s conversation by talking improperly with men.
【简答题】P eople don ’ t ___ __ ____ their __ __ _____ is already ______ __ _ when they eat chilies.
【简答题】超市里有香蕉、苹果、葡萄三种水果,单价分别为5元/斤、8元/斤、12元/斤,计算出三种水果的平均价格(实型)。如果只有39元钱,并且只能购买某一种水果整数斤,请计算并输出可以分别买几斤、各剩余多少钱。