例えば、宝くじの当たる確率は低く、期待値. を取ると買った金額より小さくなります。しかし、人は当たる可能性の低い宝くじを買い続. けます。なぜでしょうか。これは人が金額的な判断より、夢に重きを置いて意思決定してい. るためだと
統計学的意味での期待値【統計解析講義基礎】. 宝くじは、たくさん買った方が、1億円が当たる確率が高まるので、たくさん買ったほうがよいという人がいます。 しかし、果たしてそれは本当でしょうか。 例えば、以下の簡単な例で考えてみ
X 国で販売予定の宝くじ（1口あたりドル）について、 X 出現確率と賞金が次のように示されている。この宝くじの賞金の期待値が1口あたり価格の8割（ドル）となるための1等賞金はいくらか。（ 国税専門官）
【例2】 当りくじ 10 本とはずれくじ 90 本を含む合計 本のくじから，20 人の. 人が順に1本ずつ引くとき，当りくじを引く人数の期待値を求めよ．ただし，各. 人が引いたくじは元へ戻さないものとする． 答案例 k 番目に引く人が当たり
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