「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 …
確率計算は事象の網羅が基本だろが。排卵日前後に中出しで受精する確率20%×そもそもやろうと思った日が排卵日前後である確率10%(3-4日/周期)で、避妊率は99.994%に上がる。そして俺が50回もコンドームを使う確率は0%だからどうでもいい。
(via akiller)「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 …
確率計算は事象の網羅が基本だろが。排卵日前後に中出しで受精する確率20%×そもそもやろうと思った日が排卵日前後である確率10%(3-4日/周期)で、避妊率は99.994%に上がる。そして俺が50回もコンドームを使う確率は0%だからどうでもいい。
(via akiller)Posted 3 months ago 439 notes
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