标题: 揽瓜阁数学小分队第89天 [打印本页] 作者: 小白斩鸡 时间: 2021-8-5 20:23 标题: 揽瓜阁数学小分队第89天 1.说of people who donated money to xxx,1/4的⼈每⼈捐款数less than or equal to $20, 2/3的⼈每⼈捐款数more than $20 but less than $1000, 问what's the average donated money of those who donated more than $1000? 条件1:捐款数少于$1000的⼈平均每⼈捐款$135。 条件2:捐款数少于等于$20的⼈平均每⼈捐款$230.