问题 解答题

甲、乙两支篮球队进行比赛,已知每一场甲队获胜的概率为0.6,乙队获得的概率为0.4,每场比赛均要分出胜负,比赛时采用三场两胜制,即先取得两场胜利的球队胜出.

(Ⅰ)求甲队以二比一获胜的概率;

(Ⅱ)求乙队获胜的概率;

答案

(Ⅰ)根据题意,若甲队以二比一获胜,

即前两场中甲胜1场,第三场甲获胜,

其概率为P1=(C21×0.6×0.4)×0.6=0.288;

(Ⅱ)乙队以2:0获胜的概率为P′2=0.4×0.4=0.16;

乙队以2:1获胜的概率为P″2=C210.4×0.6×0.4=0.192

∴乙队获胜的概率为P2=0.42+C21×0.4×0.6×0.4=0.16+0.192=0.352.

阅读理解

阅读理解。

     Every morning Steve goes to work by train. He always buys a newspaper. It helps to make the time

pass more quickly.

     One Tuesday morning, he turned to the sports page. He wanted to read the report about an important

football match the night before. The team of his town won the match. The report was so interesting that

he forgot get off at his station. He didn't know it until he saw the sea. He got off at the next station, and

had to wait a long time for a train to go back. Of course, he arrived very late at the office. His boss (老板)was very angry when Steve told him why he was late.

(A) 根据短文内容,判断句子正(T)误(F)。

(     )1.Steve always buys a newspaper when he goes to work because he wants to read sports about

football match.

( )2.One Tuesday morning Steve forgot to buy a newspaper.

(     )3.The important football match was held on Monday evening.

(     )4.Steve found the train had gone too far when he finished reading the report.

(     )5.After Steve got off the train, he had to walk back to his office.

(B) 根据短文内容,完成下列句子,每空填一词,首字母已给出。

6.Steve e______ reading a newspaper on a train to make the time pass quickly.

7.One Tuesday morning Steve b______a newspaper as usual (像往常一样).

8.The report told Steve the team of his town was the w______.

9.The train had gone too far b______ he saw the sea.

10.After Steve got off the train, he had to take a______ train back to his office.

判断题