2024年04月29日

高校数学「確率統計」赤球3個と白球1個を100回の場合

高校数学「確率統計」赤球3個と白球1個を100回の場合

◆問題

ある袋に、赤球3個と白球1個を入れる。この袋から1個の球を取りだし、色を確認してから袋に戻すという試行を100回繰り返す。
このとき、赤球を取り出す回数Xの平均と標準偏差を求めよ。


↓解答解説はお知らせの下↓


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◆解答解説

普通に数学1Aの確率とデータの分析の内容を使えば、出すことはできますが、二項分布の考えを使うと簡単に計算できます。

1回の試行で赤球を取り出す確率は3/4(白球を取り出す確率は1/4)です。
試行回数は100回なので、

Xは二項分布B(100,3/4)に従う。ということができます。
つまり、

E(X)=100・3/4=75

V(X)=100・(3/4)・(1/4)=75/4

σ(X)=√(75/4)=(5√3)/2

となります。


確率統計まとめ


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本日配信のメルマガ。2024年共通テスト英語第5問 問1

本日配信のメルマガでは、2024年大学入学共通テスト英語第5問の問1を解説します。


【高校英語】共通テストの英文解釈
http://www.mag2.com/m/0001641009.html


■ 問題

2024年大学入学共通テストより

第5問

You are in an English discussion group, and it is your turn to introduce
a story. You have found a story in an English language magazine in Japan.
You are preparing notes for your presentation.

┌────────────────────────────────────┐
|              [Maki's Kitchen]              |
|                                    |
| "Irasshai-mase," said Maki as two customers entered her restaurant,  |
|Maki's Kitchen. Maki had joined her family business at the age of 19  |
|when her father became ill. After he recovered, Maki decided to     |
|continue. Eventually, Maki's parents retired and she became the owner. |
|Maki had many regular customers who came not only for the delicious   |
|food, but also to sit at the counter and talk to her. Although her   |
|business was doing very well, Maki occasionally daydreamed about    |
|something different.                          |
| "Can we sit at the counter?" she heard. It was her old friends, Takuya|
|and Kasumi. A phone call a few weeks earlier from Kasumi to Takuya had |
|given them the idea to visit Maki and surprise her.           |
|                                    |
|               ◆◆◆◆◆                |
|                                    |
| Takuya's phone vibrated, and he saw a familiar name, Kasumi.     |
| "Kasumi!"                               |
| "Hi, Takuya, I saw you in the newspaper. Congratulations!"      |
| "Thanks. Hey, you weren't at our 20th high school reunion last month."|
| "No, I couldn't make it. I can't believe it's been 20 years since we |
|graduated. Actually, I was calling to ask if you've seen Maki recently."|
|                                    |
|               ◆◆◆◆◆                |
|                                    |
| Takuya's family had moved to Kawanaka Town shortly before he started |
|high school. He joined the drama club, where he met Maki and Kasumi. The|
|three became inseparable. After graduation, Takuya left Kawanaka to   |
|become an actor, while Maki and Kasumi remained. Maki had decided she  |
|wanted to study at university and enrolled in a preparatory school.   |
|Kasumi, on the other hand, started her career. Takuya tried out for   |
|various acting roles but was constantly rejected; eventually, he quit. |
|                                    |
| Exactly one year after graduation, Takuya returned to Kawanaka with  |
|his dreams destroyed. He called Maki, who offered her sympathy. He was |
|surprised to learn that Maki had abandoned her plan to attend university|
|because she had to manage her family's restaurant. Her first day of work|
|had been the day he called. For some reason, Takuya could not resist  |
|giving Maki some advice.                        |
|                                    |
| "Maki, I've always thought your family's restaurant should change the |
|coffee it serves. I think people in Kawanaka want a bolder flavor. I'd |
|be happy to recommend a different brand," he said.           |
|                                    |
| "Takuya, you really know your coffee. Hey, I was walking by Cafe   |
|Kawanaka nad saw a help-wanted sign. You should apply!" Maki replied.  |
|                                    |
| Takuya was hired by Cafe Kawanaka and became fascinated by the science|
|of coffee making. On the one-year anniversary of his employment, Takuya |
|was talking to Maki at her restaurant.                 |
| "Maki," he said, "do you know what my dream is?"           |
| "It must have something to do with coffee."              |
| "That's right! It's to have my own coffee business."         |
| "I can't imagine a better person for it. What are you waiting for?"  |
| Maki's encouragement inspired Takuya. He quit his job, purchased a  |
|coffee bean roaster, and began roasting beans. Maki had a sign in her  |
|restaurant saying, "We proudly serve Takuya's Coffee," and this     |
|publicity helped the coffee gain popularity in Kawanaka. Takuya started |
|making good money selling his beans. Eventually, he opened his own cafe |
|and became a successful business owner.                 |
|                                    |
|               ◆◆◆◆◆                |
|                                    |
| Kasumi was reading the newspaper when she saw the headline: TAKUYA'S |
|CAFE ATTRACTING TOURISTS TO KAWANAKA TOWN. "Who would have thought that |
|Takuya would be so successful?" Kasumi thought to herself as she    |
|reflected on her past.                         |
|                                    |
| In the high school drama club, Kasumi's duty was to put make-up on the|
|actors. No one could do it better than her. Maki noticed this and saw  |
|that a cosmetics company called Beautella was advertising for      |
|salespeople. She encouraged Kasumi to apply, and after graduation, she |
|became an employee of Beautella.                    |
|                                    |
| The work was tough; Kasumi went door to door selling cosmetics. On bad|
|days, she would call Maki, who would lift her spirits. One day, Maki had|
|an idea, "Doesn't Beautella do make-up workshops? I think you are more |
|suited for that. You can show people how to use the make-up. They'll  |
|love the way they look and buy lot of cosmetics!"            |
|                                    |
| Kasumi's company agreed to let her do workshops, and they were a hit! |
|Kasumi's sales were so good that eight months out of high school, she  |
|had been promoted, moving to the big city of Ishijima. Since then, she |
|had steadily climbed her way up the company ladder until she had been  |
|named vice-president of Beautella this year.              |
|                                    |
| "I wouldn't be vice-president now without Maki," she thought, "she  |
|helped me when I was struggling, but I was too absorbed with my work in |
|Ishijima to give her support when she had to quit her preparatory    |
|school." Glancing back to the article, she decided to call Takuya.   |
|                                    |
|               ◆◆◆◆◆                |
|                                    |
| "Maki wasn't at the reunion. I haven't seen her in ages," said Takuya.|
| "Same here. It's a pity. Where would we be without her?" asked Kasumi.|
| The conversation became silent, as they wordlessly communicated their |
|guilt. Then, Kasumi had an idea.                    |
|                                    |
|               ◆◆◆◆◆                |
|                                    |
| The three friends were talking and laughing when Maki asked, "By the |
|way, I'm really happy to see you two, but what brings you here?"    |
| "Payback," said Takuya.                        |
| "Have I done something wrong?" asked Maki.              |
| "No. The opposite. You understand people incredibly well. You can   |
|identify others' strengths and show them how to make use of them. We're |
|proof of this. You made us aware of our gifts," said Takuya.      |
| "The irony is that you couldn't do the same for yourself," added   |
|Kasumi.                                 |
| "I think Ishijima University would be ideal for you. It offers a   |
|degree program in counseling that's designed for people with jobs," said|
|Takuya.                                 |
| "You'd have to go there a few times a month, but you could stay with |
|me. Also, Takuya can help you find staff for your restaurant," said   |
|Kasumi.                                 |
| Maki closed her eyes and imagined Kawanaka having both "Maki's    |
|Kitchen" and "Maki's Counseling." She liked that idea.         |
└────────────────────────────────────┘

Your notes:
┌────────────────────────────────────┐
|              [Maki's Kitchen]              |
|                                    |
|[Story outline]                             |
|Maki, Takuya, and Kasumi graduate from high school.           |
||[ 30 ]                                |
||[ 31 ]                                |
||[ 32 ]                                |
|↓[ 33 ]                                |
|Maki begins to think about a second career.               |
|                                    |
|[About Maki]                              |
|・Age: [ 34 ]                              |
|・Occupation: restaurant owner                     |
|・How she supported her friends:                    |
|  Provided Takuya with encouragement and [ 35 ].           |
|   〃   Kasumi 〃   〃    and [ 36 ].           |
|                                    |
|[Interpretation of key moments]                     |
|・Kasumi and Takuya experience an uncomfortable silence on the phone  |
| because they [ 37 ].                         |
|・In the final scene, Kasumi uses the word "irony" with Maki. The    |
| [irony] is that Maki does not [ 38 ].                 |
└────────────────────────────────────┘

問1 Choose [four] out of the five events ({1}〜{5}) and rearrange them in
the order they happened. [ 30 ]→[ 31 ]→[ 32 ]→[ 33 ]
{1} Kasumi becomes vice-president of her company.
{2} Kasumi gets in touch with Takuya.
{3} Maki gets her university degree.
{4} Maki starts working in her family business.
{5} Takuya is inspired to start his own business.


つづく


※一部の図や記号は省略または類似のものに変更、マーク部分の□や下線部は[ ]、
マル1は{1}で表記しています。
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★★★★★★★「AE個別学習室(えまじゅく)」生徒募集!★★★★★★★★
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★ 「AE個別学習室(えまじゅく)」では、生徒募集をしています。   ★
★ 対象は小学生・中学生・高校生・浪人生。社会人も歓迎します!   ★
★ オンライン授業も好評です!全国の生徒さんに対応可能です。    ★
★                                 ★
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 えまじゅくでは、経験豊富なプロ講師のマンツーマン授業が受けられます。
 授業料が最大で40%引きになる、2人〜4人の同時指導も好評です!
 今年も何人もの生徒さんが、第一志望(以上)の結果を出してくれました。

 興味をお持ちの方は、まずは mm@a-ema.com までお問い合わせください。

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■ 問いの内容と解説

問1 Choose [four] / out of the five events ({1}〜{5})
/ and rearrange them / in the order / they happened.
[ 30 ]→[ 31 ]→[ 32 ]→[ 33 ]
[4つ]を選びなさい / 5つの出来事({1}〜{5})から
/ そしてそれらを並べ替えなさい / 順に / それらが起こった

{1} Kasumi becomes vice-president / of her company.
Kasumiは副社長になる / 彼女の会社の

{2} Kasumi gets in touch / with Takuya.
Kasumiは連絡をとる / Takuyaと


(以下略)


(有料版では、解説の続きも掲載しています)
 http://www.mag2.com/m/0001641009.html

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解説の続きは、本日21時配信予定の

【高校英語】共通テストの英文解釈
 http://www.mag2.com/m/0001641009.html

に掲載します!
全て長文問題になった大学入学共通テスト。今まで以上に読解力が求められます。
翻訳も行っている著者が、スラッシュリーディング、全文訳とともに解説します。
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------------------------------------------------------------------------
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ラベル:英語
posted by えま at 17:00| Comment(0) | TrackBack(0) | メルマガ | このブログの読者になる | 更新情報をチェックする

高校情報「画像と音の表現」画像のデジタル表現A

高校情報「画像と音の表現」画像のデジタル表現A

◆問題

空欄に適語を入れてください。

 [画像のデジタル表現]
ディスプレイやプリンタなどの性能を表す用語として(@)が用いられる。(@)は、標本化の分割の細かさに依存する。
量子化では、色の段階を表現する(A)によって数値化される。(A)が大きいほどより正確な色を表現できる。カラー画像であれば、(B)それぞれを量子化し、それらの組合せで表現する。


↓解答はお知らせの下に↓

評価が高い情報のテキストはコレ!
学校で習っていなくても読んで理解できる 藤原進之介の ゼロから始める情報I


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★★★★★★★「AE個別学習室(えまじゅく)」生徒募集!★★★★★★★
★                                ★
★   茨城県水戸市、常陸太田市の個別指導教室          ★
★ 「AE個別学習室(えまじゅく)」では、生徒募集をしています。  ★
★ 対象は小学生・中学生・高校生・浪人生。社会人も歓迎します!  ★
★ オンライン授業も好評です!全国の生徒さんに対応可能です。   ★
★                                ★
★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★

 えまじゅくでは、経験豊富なプロ講師のマンツーマン授業が受けられます。

 授業料が最大で40%引きになる2人以上の同時指導も好評です!
 今年も何人もの生徒さんが、第一志望(以上)の結果を出してくれました。

 お問い合わせはこちらへどうぞ

 家庭教師・塾のサイト→ http://www.a-ema.com/

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━


◆解答

@解像度、A階調、B光の三原色

 [画像のデジタル表現]
ディスプレイやプリンタなどの性能を表す用語として解像度が用いられる。解像度は、標本化の分割の細かさに依存する。
量子化では、色の段階を表現する階調によって数値化される。階調が大きいほどより正確な色を表現できる。カラー画像であれば、光の三原色それぞれを量子化し、それらの組合せで表現する。


前の問題→画像のデジタル表現@
次の問題→光の三原色


−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
 20年以上の実績。全学年、英・数・理をはじめ全教科対応
  最高級の指導を提供します!メール添削も好評です!

プロ家庭教師の江間です。    AE個別学習室(えまじゅく)
http://www.a-ema.com/k/     http://www.a-ema.com/j/
−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
posted by えま at 08:00| Comment(0) | TrackBack(0) | 高校情報 | このブログの読者になる | 更新情報をチェックする
こんなヤツです
名前:江間淳
年齢:41
職業:プロ家庭教師、AE個別学習室(えまじゅく)代表、翻訳者
ウェブサイトURL:http://www.a-ema.com/
メールアドレス:j@a-ema.com
一言:アプリ、メルマガ、電子書籍提供中です。アマゾンやGooglePlayで「江間淳」で検索!
江間淳の書籍一覧 → http://amzn.to/2m9LTvN