题目

(16分) 随机抽取某厂的某种产品400件，经质检，其中有一等品252件、二等品100件、三等品40件、次品8件．已知生产1件一、二、三等品获得的利润分别为6万元、2万元、1万元，而1件次品亏损2万元．设1件产品的利润（单位：万元）为． （1）求的分布列和数学期望； （2）经技术革新后，仍有四个等级的产品，但次品率降为，一等品率提高为．如果此时要求1件产品的平均利润不小于4.73万元，则三等品率最多是多少？阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空白处填入一个适当的词或使用括号中词语的正确形式填空。Mr King goes to 1. dinner party.He is wearing old clothes.He comes into the room.But people in the room 2.(not)look at him.They don't ask him 3.(sit)at the table.Mr King goes home and puts 4. his good clothes.He is back to the party.Everyone in the room 5.(stand)up.They are smiling at him and they give him very good food to eat.Mr King takes off his clothes 6. puts them in the food and says，“Eat，clothes！” The other people ask，“What are you 7.(do)？” He answers，“I'm asking 8.(I)coat to eat food.I wear my old clothes.You don't look at me.You don't ask me to sit 9..Now I'm in these clothes.And you give me very good food.Now I see，you give the food to my clothes，10. not me！”