Mathematics
Senior High
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(3)で 1−𓏸𓏸 となるのはなぜですか?
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147 確率変数Zが標準正規分布 N (0,1)に従うとき,次の確率を求めよ。
□(1) P(Z≦0.6)
□ (2) P(Z>2)
□(3) P(Z>0.75)
p.72 例15
147. (1) P(Z≤0.6)=P(Z≤0)+P(0≤Z≤0.6)
=0.5+0.2257=0.7257
(2) P(Z>2) P(Z≥0)-P(0≤Z≤2)
=0.5-0.4772=0.0228
(3) P(|Z|>0.75)=1-P(|Z|≤0.75)
=1-P(-0.75≤Z≤0.75)
=1-{P(-0.75≤Z≤0)+P(0≤Z≤0.75)}
=1-2P(0≤Z≤0.75)
=1-2×0.2734
=1-0.5468=0.4532
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助かりました!ありがとうございます!!