Grade

Type of questions

English Junior High

至急 問1教えてください!

3 次の英文を読んで、後の各問に答えよ。 Hiroshi is a junior high school student. One day in an English class, his teacher said, "We have many kinds of new technology around us. Computers, the Internet, and AI are good examples. Do you know any people who use them well? In our next project, I want you to introduce one person in class." So at home that night, Hiroshi asked his mother, and she said to him, "Your grandmother, Toshiko, uses new technology well." A few days later, Hiroshi talked with Toshiko on the Internet about the project. She said, "Well, you know I am a fruit farmer. I didn't use technology very much in the past. But now, I use it every day. There are many benefits of using new technology. I collect information about the weather from websites. I can understand my fruit's growth by keeping records and can share that information with researchers and farmers who live in other parts of Japan. Then I can get good ideas from them and make my fruit bigger and better. Now I don't need to give water to my fruit trees because AI technology can do 2 that job. Also, it is easy for me to sell more fruit by using the Internet. In these ways, new technology has changed my way of working and made it better. On my website, I show other farmers how to use new technology which helps us grow better fruit." Hiroshi decided to talk about her to his classmates. A month later, Hiroshi made a speech in front of his classmates. After the speech, his classmate, Asuka, said, “In your speech, I like the story of your grandmother's website. She shows her ideas about using new technology for agriculture. I hope people will be interested in her website. If they see it, they will learn her ways to grow fruit. Then, they will be influenced by her and start working like her. I really respect her." Hiroshi was very happy to hear that. He said to Asuka, "Using new technology in effective ways has been changing the lives of many people. I want to learn about this more and create a better society in the future." 受羽課題 プロジェクト

Unresolved Answers: 1
Mathematics Senior High

(2)で、10回目までに赤玉5個、白玉5個を取り出せば白玉が5個残るかとおもったんですけど、なぜ9回目までに赤玉4個白玉5個取り出す確率を求めて10回目で赤玉を取り出す確率をかけているのですか??🙇‍♀️

出し, それが る。こ 率 基本 52 基本例題 54 確率の乗法定理 (3) 赤玉5個と白玉10個が入っている袋の中から無作為に1個ずつ取り出す操 作を続ける。ただし、取り出した玉は袋には戻さないものとする。このとき, 次の確率を求めよ。 (1) 赤玉が先に袋の中からなくなる確率 (2) ちょうど赤玉が袋の中からなくなって,かつ,袋の中に白玉5個だけが 残っている確率 [類 姫路工大] 基本 47 CHARTI OLUTION 回目の試行の確率 (n-1) 回目までに着目 (1) 赤玉が先になくなるということは, 15個すべてを取り出すとき,最後は白玉 を取り出すことである。 すなわち, 5個目の赤玉が14回目までに出るということ 14回で赤玉5個, 白玉 9個が出るということである。 (2) 操作の回数は10回 9回目までの情報について考える。 。 □・・ 解答 (1) 先に赤玉がなくなるには,最後の1個が白玉であればよい。 すなわち, 14回目までに赤玉5個と白玉9個を取り出せばよ いから, 求める確率は は 1/2 であるから、求める確率は 6 ...... 5C5X10C9 10_2 15C14 15 3 10156580 (2) 9回目までに, 赤玉4個と白玉5個を取り出す確率は 5 C4 X 10 C5 36 15C9 143 残りの赤玉1個と白玉5個の中から赤玉1個を取り出す確率 36 143 6 x 1/6=143 201 ← (15-1) 回目まで。 315 p.291 INFORMATION で述べたように,「1個 ずつ戻さずに取り出す 確率」と「同時に取り出 「す確率」 は同じであるか ら、このように組合せで 考えてよい。 an h ◆乗法定理を利用。 2章 6 条件付き確率確率の乗法定理

Resolved Answers: 1