学年

教科

質問の種類

数学 高校生

例題も練習問題もデータの値を2倍した時の分散を求めるのに、どちらも2の二乗が使われているのはなぜですか?

(A半)率3の合 変量の変換 第5章 データの分析 例題 12 次のデータは,ある生徒5人の数学の試験の得点を記録したものである。 7, 3, 8,2, 10 (点) (1) このデータの平均値と分散を求めよ。 (2) 5人全員の得点それぞれに 10を加えたデータの平均値と分散を求めよ。 (3) 5人全員の得点をそれぞれ2倍にしたデータの平均値と分散を求めよ。 【類仁愛大) 変量の変換を用いて,見通しよく計算する 考え方 変量x,yについて,y=ax+b (a, bは定数)であるとき, x, yのデータの平均値をx, y, 分散を s, s,, 標準偏差を S, s, とすると →(2)では a=1, b=10, (3) では a=2, 6=0 と考えて, (1) の結果を利用する。 ソ=ax+6, s,"=a's., s,=|a|s. ポイント (解答 1 定義から求める 1 -(7+3+8+2+10) = 30 -=6 (点) 圏 5 (1) 平均値は (7-6)°+(3-6)+(8-6)*+(2-6)°+(10-6)")= =9.2 匿 分散は 46 5 2 (1)の結果を利用 →(2) 5人全員の得点それぞれに 10を加えたときの平均値は 6+10=16(点) 器 分散は,(1)と同じで 9.2 容 (1)の結果を利用 → (3) 5人全員の得点をそれぞれ2倍したときの平均値は 2?×9.2=36.8 圏 2×6=12(点) 闇 月 分散は 練習 10個の値からなる次のデータについて考える。 12 10, 6, 9, 4, 7, 2, 3, 5, 1, 3 (1) このデータの平均値,分散, 標準偏差を求めよ。 (2) このデータの値それぞれに3を加えたデータの平均値, 分散, 標準偏差を求めよ。 (3) このデータの値をそれぞれ2倍したデータの平均値, 分散, 標準偏差を求めよ。 【類京都学園大) Aからまで最

解決済み 回答数: 1
英語 高校生

赤枠ではなんて言ってるのでしょうか? (ウ)にはmissが入ります なぜテレグラムで会ったのに赤枠の直後の文では彼の肩に手を置けたのでしょうか?

There was a skinny young boy who loved football with all his heart, (1)Practice (after practice, he eagerly gave everything he had. But being half the size of the other boys, (a)he got absolutely nowhere. At all the games this hopeful athlete sat on the bench and hardly ever played. This teenager lived alone with his father. Even though the son was always on the bench, his father was ( ア ) in the stands cheering. When the young man went to college, he decided to join the football team. Everyone was sure he could not bea member. But the coach enrolled him because he always put his ( イ ) and soul into every practice, and at the same time, provided the other members with the spirit and hustle they badly needed. It was the end of his senior football season, and as he ran onto the practice field shortly beforel the big playoff game, the coach met him with a telegram. The young man read the telegram and he became deathly silent. Swallowing hard, he mumbled to the coach, "My father died this morning. Is it all right if I ( ウ ) practice today?" The coach put his arm gently around his shoulder and said, "Take the rest of the week off. And don't even plan to come back for the ( I ) on Saturday." Saturday arrived, and thegame was not going well. In the third quarter, when the team was ten points behind, a silent young man quietly slipped into the empty locker room and put on his protector. As he ran onto the sidelines, the coach and his players were ( オ ) to see their faithful team mate back so soon. "Coach, please let me play. I've just got to play today," said the young man. (2)The coach pretended not to hear him. He didn't want his worst player in this close playoff game ーー Gnalll foolina corny for the vOuna man, (hithe coach gave in. "A

未解決 回答数: 1