Mathematics
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2枚の硬貨を同時に投げるとき、裏が出る枚数の期待値を求めよ。
期待値 数a

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✨ Best Answer ✨

2枚とも裏 1枚裏 が出る確率はそれぞれ
1/4 1/2 より
1/4 *2 +1/2*1 =1 よって1枚

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