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数学 大学生・専門学校生・社会人

標本平均についてです。 写真の問題を見たときに、①0か1の2択であること②政党支持率は30%で一定であること③0か1の番号に振り分けることを繰り返すことの3つの条件が揃っていたので、二項分布だと思い、二項分布B(n,0.3)に従うと考えました。 そのため問1の期待値を0.3... 続きを読む

基本 例題164 標本平均の期待値,標準偏差 ある県において, 参議院議員選挙における有権者のA政党支持率は30%である という。この県の有権者の中から,無作為にη人を抽出するとき,k番目に抽出 された人が A 政党支持なら1, 不支持なら0の値を対応させる確率変数を Xんと する。 (1) 標本平均 X= X+X2+・・・・・+Xn について, 期待値E (X) を求めよ。 059 n | (2) 標本平均 X の標準偏差 (X) を 0.02以下にするためには, 抽出される標本 の大きさは、少なくとも何人以上必要であるか。 指針 (1) まず, 母平均 m を求める。 p.636 基本事項 4 4章 21 (2)まず,母標準偏差のを求める。そして, o(X)≦0.02 すなわち 1 小の自然数 n を求める。 0.02 を満たす最 n 解答 (1)母集団における変量は,A 政党支持なら1,不支持なら0 という2つの値をとる。 Xh 1 0 at P 0.3 0.7 1 よって, 母平均は m=1・0.3+0・0.7 = 0.3 (2)母標準偏差は ゆえに EX) =m=0.3 o=√(12・0.3+020.7) -m²=√0.3-0.09 =√0.21 統計的な推測 よって o(X) = √n 0.21 √n 28.18 √0.21 0.21 0.02 とすると,両辺を2乗して ≦0.0004 n n 小数を分数に直して考えて もよい。 (S) T 2100 0.21 0.21 ゆえに NZ = =525 ≦0.02 から 0.0004 4 √n この不等式を満たす最小の自然数n は n=525 √21 したがって、少なくとも525人以上必要である。 1-5 よって1/15 n 25 21

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英語 高校生

全部教えて欲しいです😭

1 Choose the best answer to fill in each blank. (1) Most stores in the Seaside Mall used to ( ) at 10:00 a.m. every day. 1 open 2 opens ③ opened 【関西学院大】 ④ opening (2) There were many people who ( ) to be served at the (1) 参 p. (2) 【立教大 】 その他 参 Þ counter before me. 1 had waited 2 have waited ③ was waiting 4 were waiting (3) Stamps ) in post offices. 【岡山商科大 *】 (3) 参 「する 1 sell 2 are selling 3 have sold 4 are sold pists (4) This soup ). (4) 参 S+V ①is tasting bitter tastes bitter (5) John and his brother ( days. Something must have 1 were absent 3 have been absent 2 is tasting bitterly 4 tastes bitterly from school for the past nine happened to his family. (5) 参 状態 2 absented 4 are absent (6) "Do you think Margaret will take one of your little cats?" (6) 参 第 "I don't know. She seemed ( ) in them, however." see ①to be interest 2 interesting 【 青山学院大 】 3 interested 4 interestingly (7) My mother has just ( ) to the supermarket. Now she's (7) home. 1 gone went ③3 visited been (8) Satoshi has wanted to ( ) his girlfriend since he was in (8) college. O marry 2 marry to 3 marry with 4 get married (9) Mr. Wallance will meet his friends at the restaurant to ( ) about their vacation plans. (9) 【京都外国語大 * 】 1 discuss 2 mention 3 express 4 talk (10) I ( ) for a parking place for half an hour, but I can't find [(10) 【亜細亜大】 one. 1 look 2 could look 3 will look 4 have been looking

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英語 高校生

アップグレードの助動詞の問題です。 よければ教えて頂きたいです。

2助動詞 22 We could not help but ( laugh ) at the sight. laughed 3 to laugh 23 We can't thank you ( ⑪very 2 too laughing ( 神奈川大 ) ) much for your kind help. We owe our success to you. ③ so ④as 24 彼はうそをついたのだから, アンが怒るのももっともなことだ。 He told a lie, so Ann ( ) get angry with him. Omay well 25 You might ( as well may as well ③may as (福島大) behnamob yo fiom might as well BE (浜松大) ceremony. ( 青山学院大) ) call a taxi. Then you will be on time for the wedding cere 2 as well as ③well so well to virus ☐ 26 You ( ) expect a river to flow backward as hope to persuade him into resignation. Omay well might as well had better would better (同志社大) 27 I would rather walk than ( ) a taxi. 1 take 2 taking ③3 to take ④taken ( 青山学院大 ) 28 One should not rely completely on first impressions, for appearances ( ) be deceiving. O shouldn't 2 have to 29 皆様のご多幸とご健康をお祈りします。 30 ③ mustn't it were no ) you all be happy and well! (a) It is not good that you didn't ask her name. (b) You ( ) have asked her name. ①ought to ②need 3 must ④can (大) work. OP ( 獨協医科大) (関西学院大) may 31 My sister ( ) here by now, for she took the early train. Omustn't have arrived 3 might arrive shouldn't have arrived ought to have arrived (上智大) "So the thief ( 32 "The window was unlocked and there is mud on the floor." come into the apartment that way." O might 2 must have ③ ought to A should have (学習院大) 33 Would you like ( ou like ) that work? 19 :以下 Ome to do to do to me O to me do 4 to me to do (名城大)

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英語 高校生

アップグレードの助動詞の問題です よければ教えていただきたいです。

2 2助動詞 標準問題 )に入れるのに最も適切なものを選びなさい。 13, 16, 29は( )に適語を入れなさい。 ☑: 11 I'm awfully sorry, but I had no choice. I simply ( ) what I did. had to do 3 must do 12 You are too kind! You ( ) me a present. must have done ought to have done ✓ 13 didn't have to buy 3 must not buy (國學院大) hadn't to buy mustn't have bought (学習院大) ( 内に記入された文字に続けて, 単語を完成させなさい。 The horse refused to jump over the gate. = The horse (w ) not jump over the gate. (日本大) E AL 14 Linda doesn't dance much now, but I know she ( ) a lot. ①was used to ②used to ③ would A would have bleora (立命館大) 15 I never expected that she ( ) us. ①joins 2 will join 3 would join 4 join (東京家政大) ✓ 16 ジョンはいつも早起きするが,私はめったに早起きしない。 John always gets up early, but I seldom ( 17 Nancy ( ) in the office this morning, but we didn't see her there. and of juods (静岡大) O should be may not have been might have been might be (関西学院大) 18 George ( ) have said so, because he told me quite the opposite thing yesterday. I will not ②cannot 3 must A should (京都産業大) 19 It was not your fault. You ( 1 can might not have apologized on the spot then. ③ must 4 should not (京都女子大 ) I was 20 She requested that the door to her room ( 21 My father insisted I ( ) go to see Kyoto. ) left open. ②would be ③be 4 had been (同志社大) 01 eval 'nob O might 2 ought ③ should 4 would alif bluow Ieb (京都産業大) of nival xalq ☑

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