「コンドームの避妊率は99.7%です」というととても安全そうに見えるが、これは「50回使って一度も避妊...

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「コンドームの避妊率は99.7%です」というととても安全そうに見えるが、これは「50回使って一度も避妊に失敗しない確率は86%です」と等価なので、言うほど絶対安全というわけではないことが分かる #確率を勉強する理由

Twitter / @asamorihisaya: 「コンドームの避妊率は99.7%です」というととても … (via tsupo)

これ外れたとかの、きちんと使えてない場合が入ってたんじゃね

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via konya

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