题干

某学校在一次第二课堂活动中,特意设置了过关智力游戏,游戏共五关.规定第一关没过者没奖励,过n(n∈N*)关者奖励2n1件小奖品(奖品都一样).如图是小明在10次过关游戏中过关数的条形图,以此频率估计概率.

(Ⅰ)求小明在这十次游戏中所得奖品数的均值;

(Ⅱ)规定过三关者才能玩另一个高级别的游戏,估计小明一次游戏后能玩另一个游戏的概率;

(Ⅲ)已知小明在某四次游戏中所过关数为{2,2,3,4},小聪在某四次游戏中所过关数为{3,3,4,5},现从中各选一次游戏,求小明和小聪所得奖品总数超过10的概率.

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答案(点此获取答案解析)

解:(Ⅰ)小明的过关数与奖品数如下表:

过关数

0

1

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    Mum and dad are two of the most important people in your life. You probably see at least one of them every day. And they influence (影响) you more than anyone else you meet in your 1ife. So if your mom loves to read, you just might grow up carrying a book wherever you go, just like she does.

    But parents do a lot more than just passing on their hobbies. Mums and dads care for(关心)their children from the minute they were born. So they are the people we should respect(尊敬) and love best. It's very important to stay close, get along, and build a strong relationship with your parents. But not every child knows how to do this. Here are some ways to help you.

    Spend time together. Don't play a computer game or watch TV, ask your mum and dad to play with you. Go outside together, or read a book out loud.

    Be kind. Little things might mean a lot to your mum or dad. You can make your parents happy with a hug (拥抱), a card, or a joke(笑话). It's also lovely when a child cleans up his or her room without being asked. And if you try not to fight with your brothers or sisters, your parents might be very happy.

    Do your best at whatever you do. You don't have to be perfect, but when you do your best, you make your parents proud(自豪). It makes them happy to see how you're turning into a great kid. Why? Because it lets them know you're doing a good job.

Title: ____ influence children most

____ for respecting parents

Parents do a lot more than just passing on their____and care for their ____from the minute they were born.

Some ____about how to get along with (相处) your parents

1). Spend more time together ____parents

2). Be ____ to parents. For example, you can help them____ their room.

3). Do your best at whatever you do to make them proud and ____because they know you are doing ____ in something.