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数学 高校生

例題178の分散の求め方が分かりません。教えてください🙏🏻

古7 78 ばAとちの2つのクルーー っ間 を集村したと ころ、モ ・ や の平均値を 分峰をsa テ (公式) se=記(< "とすると| がの立つ。公利用じで。 本 で用すれば人全体の分了は朱めくい クタの2乗の総和をを求め、調放、公| この方針で求める際、それぞれのテー 多, ん のデータの値まそれそれ で表すと考えゃすい。 下の解容では、 が たぢ| デー は ・ Je として考えている。 なお, 慣れてきたら, デ クの値を文字などで表きずに のおやccいい 人なの 平均値は 2 紹 20+60 13 集団全体の総和は 20x16-+60x12 4 の硬を<とし。 データの値を また jBの変量をッとし, データの値を っ ェッのデータの平均値をそれぞれエ ヶ 。ーデダー(⑦)? より, 記 ze2二 十*el三20 (24二16)ニ160x35 マーアー⑦)” より, アーs2上⑦⑰* であるから すすーー十Jey王60X(28二12)ー24043 よって, 集団全体の 分英は <デー二Getft…ーキの 生還全体の平均値は 3 -寸オアy寺上……上ys)一13 fyでTe き の 和 ー169=30 集団全体平均値 CFO 1a 人4 のデータの 2 乗の平均値は 24十16? であり, B のデータの 2 乗の平均値は 28+127 で あるから, 集団全体の 分英は 20X(24二16)十60メ(28十12? 20十60 160x35寺240X43 ATL3 80 ー169=30

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英語 高校生

丸は気にしないでください(><) 答え教えていただけると嬉しいです😭

間 JH OUT culture, where the use ot dictionaries 1S WideSDread。many people may have the impression that a word's meaning is simply its dictionary definition.A little thought should show however, that there must be more to meaning than this. It is true that when someone wants to find out what き Word means, an easy and practical way to do it is to look the word up ina dicionary. Most people in our caltare accept dictionaries as providing unauestionably authoritative accounts of the meanings of the words they define. [2] Thenoleof dictionaries/ in our society as authorities on meaning 1eads many people to feel that the dicionary dehnition of a word more accurately represents the word's meaning than does an individual speaker's nderstanding of the word. Keep in mind/ however。 that the people who write dictionaries arrive at their definitions by studying the ways speakers of the language use different words. Some dictionaries are relatively prescriptive\、 others more descriptive* but all must face the fact that a word means what people use it to mean。 There simply is no higher authority than the general community of native speakers of the language. This is obyiously the position one must take in descriptive analysis、 but even in prescriptive grammar, words cannot be given strange defimitions that dont correspond to actual uses of those words by the speech community. A word's meaning is determined by the people who use that word, not by a dictionary- [3] The iqea that a dictionary definition is all there is to a word's meaning runs into even more serious problems when one considers that im order to understand the dictionary definition of a word, one must know the meanings of the words used in that definition: For example. 下 the word ecfo7xere is defined as 'a blastomere that develops into ectoderm'、one must ee he 0 Me 0 Pd Side

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英語 高校生

教えてください🙇‍♀️

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