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数学 高校生

(2)についてなのですが、私の回答が間違いなのはなぜでしょうか?

No. Date (3) 56. 5m (1全体の数をxとする 6cm 5 H 6 r [n]]]] Date. 200 Aの個数は G.7x Aの不良品数は0.3.0.7x Bの個数は0.3x Bの不良品数は0.3x-0.05. よってP(E) (2) PE(A) = 0.03.0.7x+0.3x20.05 XCI =0.02x+ こ JJ = = XC₁ 0.036x÷x 36x 1000 250 9 250 WER 0.0.15x 21 x PE (A) = 0.021 x ²9 256 1000 PCEDA)なので、DF(A)=0.021x PETA) PE) 1,000 1 1 x P(A) O 1000 250 ス・x KRENAL PCEVA) 7x 12 (P(E) 56 原因の確率 基本例題 ある部品を製造する機械 A,Bがあり、不良品の発生する割合は,Aは3 58では5%であるという。 Aからの部品とBからの部品が7:3の割合 00000 ※大量に混ざっている中から1個を選び出すとき、それが不良品であるとい う事象をEとする。 (1) 確率P(E) を求めよ。 (2) 事象Eが起こった原因が,機械Aにある確率を求めよ。 OLUTION CHARTO 事象 E (結果) を条件とする事象A (原因) の起こる確率 P(ENA) P(E) Bの製品であるという事象をBとすると 3 10' 条件付き確率PE (A)= (1) 排反な事象に分解して求める。 (2)「不良品である」ということがわかっている条件のもとで、それが機械Aの製 品である確率(条件付き確率)を求める。 解答 選び出した1個が, 機械Aの製品であるという事象をA, 機械 inf. 次のように、具体的 3 100' 47,P(B)= PA(E)=- PB (E) = 10' 5 100 P(A)=- 不良品には,機械Aで製造された不良品と機械Bで製造さ れた不良品の2つの場合があり,これらは互いに排反である。 P(E)=P(A∩E)+P(B∩E) よって =P(A)PA (E)+P(B)PB (E)= (2) 求める確率は PE (A) であるから P(ENA) P(ANE) P(E) PE(A)= P(E) 7 3 3 100 10 × + 10 20956 × ÷ 7 12 9 21 250. 1000 9 5 100 250 <INFORMATION 原因の確率 上の例題 (2) は, 「不良品であった」という“結果”が条件と して与えられ、「それが機械Aのものかどうか」という“原 因” の確率を問題にしている。 この意味から (2) のような 確率を原因の確率ということがある。 基本53 な数を当てはめて考えると, 問題の意味がわかりやすい。 全部で1000個の製品を製 造したと仮定すると 機械 製造数 不良品 A 700 21 B 300 15 計 1000 36 (1) の確率は (2) の確率は E 21 E 317 1000 36 1000 241 250 A B ANE BOE 9 3 250 200 2章 9 250 21 7 36 12 6 条件付き確率 確率の乗法定理 PRACTICE・・・ 56 ③ ある集団は2つのグループA, B から成り, Aの占める割合は40 「生したときに, 選び出された1個がBのグループに属している確率を求めよ。 %である。 また, 事象Eが発生する割合がA では 1%, B では3%である。 この集 団から選び出した1個について, 事象Eが発生する確率を求めよ。 また、事象Eが発

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英語 中学生

暗いし、長いし、申し訳ないです💦 3以外の、1、2、4、5、6、7を教えてください🙏🙇‍♀️

4 次の英文は、中学生の彩音 (Ayane)が、アメリカ滞在中のホストファミリーであるスミ ス夫妻 (Mr. and Mrs. Smith)の親戚であるベルギー(Belgium)出身の大学生 (university student) のエレン (Ellen) と交流した話です。 1~7の問いに答えなさい。 I've lived here since Ayane stayed in the United States this summer to study English. First, she lived only with Mr. and Mrs. Smith. A week later, Mr. Smith said, "I came to work in the United States from Belgium about twenty years ago. then, but some of my family still live in Belgium. My brother's daughter will come from Belgium to live here. Her name is Ellen, and she will go to university s here. I hope you will be good friends." Soon after that, Ellen came. She started studying at the university to run her own business in the future. She was very kind. Ayane and Ellen often went out together on weekends. ア Before the movie, 10 One day, Ayane and Ellen went to see a movie. they went to a shop to buy something to eat. Ellen bought a hamburger and some French fries. Ayane said, "Do you know that ( 2 )? It's 'fried potatoes." Ellen was surprised. She asked Ayane, "Where did French fries originally come from?" Many people think they are from the United States. Ayane thought they came from France because the name is "French" fries. So she answered, “France !” 15 That was wrong. Ellen said that French fries were originally from Belgium. Ayane was surprised. Ellen said, "When American soldiers went to Europe in World War I, they ate frites. Frites are popular food in Belgium. They're like French fries. The American soldiers liked them. The people in the area spoke French at that time, so the soldiers thought the area was in France. Later the 20 soldiers brought the food to the United States. So the name became French fries." That was an interesting story to Ayane. She didn't know that people speak French in some areas of Belgium. Ellen also can speak French. Ayane was surprised again. Then Ayane bought some waffles at the shop because she heard they were 25 very good. Ayane said, "Waffles are also originally from your country, right?" Ellen answered, "Yes. I've liked them since I was a child." Ayane heard that Ellen's dream is to run waffle shops in many countries. She hopes waffles will spread into more countries, so she is studying business at the university. Ayane said, "These waffles are nice! I like waffles, too. When you start your 30 waffle shop in Japan, can I help you at the shop?" Ellen answered, "Yes. Oh, the movie will start soon. Let's go, Ayane!" "Yes, let's go," Ayane said. Ayane was happy because she understood Ellen and her country better.

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英語 中学生

長いですが、教えてください🙏

4 次の英文は、中学生の彩音 (Ayane) が、 アメリカ滞在中のホストファミリーであるスミ ス夫妻 (Mr, and Mrs. Smith) の親戚であるベルギー (Belgium) 出身の大学生 (university student) のエレン (Ellen) と交流した話です。 1~7の問いに答えなさい。 Ayane stayed in the United States this summer to study English. First, she lived only with Mr. and Mrs. Smith. A week later, Mr. Smith said, "I came to work in the United States from Belgium about twenty years ago. I've lived here since then, but some of my family still live in Belgium. My brother's daughter will come from Belgium to live here. Her name is Ellen, and she will go to university s here. I hope you will be good friends." Soon after that, Ellen came. She started studying at the university to run her own business in the future. She was very kind. Ayane and Ellen often went out together on weekends. One day, Ayane and Ellen went to see a movie. ア Before the movie, 10 they went to a shop to buy something to eat. Ellen bought a hamburger and some French fries. Ayane said, "Do you know that ( )? It's 'fried potatoes." Ellen was surprised. She asked Ayane, "Where did French fries originally come from?" Many people think they are from the United States. Ayane thought they came from France because the name is "French" fries. So she answered, "France !" 15 That was wrong. イ Ellen said that French fries were originally from Belgium. Ayane was surprised. Ellen said, "When American soldiers went to Europe in World War I, they ate frites. Frites are popular food in Belgium. They're like French fries. The American soldiers liked them. The people in the area spoke French at that time, so the soldiers thought the area was in France. Later the 20 soldiers brought the food to the United States. So the name became French fries." That was an interesting story to Ayane. She didn't know that people speak French in some areas of Belgium. Ellen also can speak French. Ayane was surprised again. Then Ayane bought some waffles at the shop because she heard they were 25 very good. Ayane said, "Waffles are also originally from your country, right?" Ellen answered, "Yes. I've liked them since I was a child." Ayane heard that Ellen's dream is to run waffle shops in many countries. She hopes waffles will spread into more countries, so she is studying business at the university. Ayane said, "These waffles are nice! I like waffles, too. When you start your 30 waffle shop in Japan, can I help you at the shop?" Ellen answered, "Yes. Oh, the movie will start soon. Let's go, Ayane!" "Yes, let's go," Ayane said. Ayane was happy because she understood Ellen and her country better. (注) still: 今でも run ~を経営する business: 事業, ビジネス hamburger : ハンバーガー French fries / frites (= fried potatoes): フライドポテト (French は 「フランスの [語]」, fries は 「揚げ物」) originally: もとは wrong : まちがった France: フランス World War I- American : アメリカ人の soldier: t Europe ヨーロッパ waffle : ワッフル -5- area:

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数学 高校生

右側の別解についての質問です。 pベクトルのx/y/z座標を、それぞれ (pの長さ)×(pベクトルがx/y/z軸となす角) で示すことができるのは何故ですか?

重要 例題 54 ベクトルと座標軸のなす角 空間において,大きさが4で,x軸の正の向きとなす角が60° 軸の正の向きと 00000 なす角が45° であるようなベクトル」を求めよ。 また, かがy軸の正の向きとな す角0を求めよ。 指針(軸の正の向きとなす角)=(●軸の向きの基本ベクトルとなす角) と考えるとよい。すなわち, i=(1,0,0), z=(0, 1,0), 蔚=(0, 0,1), =(x,y,z)として,まず内積 per, pies を考え,x, zの値を求める。 ( 解答 (1, 0, 0), (0, 1, 0), es=(0, 0, 1), p=(x, y, z) とするとpe=xe pes=z 15 P また bet=|||e|cos60°=4×1×1/2/4②2) ! p.es = |p|les|cos 45°=4×1×- x=2,z=2√2 よって このとき |=22+y^+(2√2)=2+12 16 であるから y2=4 ここで ゆえに pez y y cos0= |lleal 4x1=4 |||ez| 4×1 =2√2 y=±2 =/20 [0] ゆえに,y=2のとき, cos0= 12/2 であるから 0=60° 181 38 y=-2のとき, Cos0=1/12 であるから 8=120° -d したがって =(2,2,2√2)=60°または p=(2, -2, 2√2), 0=120° から cosa= COS y= 160_ x 45° 0140 ALTO a=(a1,a2, as) に対して,こがx軸、y軸, z 軸の正の向きとそれぞ れなす角を α, B,Yとすると,斜辺の長さが| である3つの直角三角形 a222 ........・ A3 である。 このとき, COS α, Tala 2 a1 a Talt cos B=- 11'4 だ 4 COS β, cosy をこの方向余弦という。 また, la=a²+a2²+as² であるから, cos' a+cos' β+cos'y=1 が成り 立つ。 AZ O [別解 p=(4 cos 60°, 4 cos 0,[) 4cos 45°) ||=4であるか 5 22+16cos²0+ (2√2)=42 よって, cos'=-から 4 cos0=± これから, 0, を求める。 na 基本51 x (1) (s) a3 AZ Jel N Y- á B 0 azy 465 2章 8 空間のベクトルの内積

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