题目

Mr. Harris used to work in Dover, but then he changed his work, and he and his wife moved to another town. They did not have many friends there, but they soon met a lot of interesting people, and after a few weeks, they often went to dinner or to parties at other people's houses.Then Mrs. Harris said to her husband, We've been to a lot of other people's houses, and now we must invite them to our house, mustn't we?Yes, certainly, answered her husband, A big party will be the easiest thing, won't it? Then we can start to invite people to dinner in small numbers next month.So Mrs. Harris 15．已知在10件产品中可能存在次品，从中抽取2件检查，其次品数为ξ，已知P（ξ=1）=$\frac{16}{45}$，且该产品的次品率不超过40%，则这10件产品的次品率为（　　）A．10%B．20%C．30%D．40%