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1.假設有23%患有高血壓的病人服用某一種藥物會產生不良影響，試利用常態分配求出120位高血壓病中服此藥物之後，超過32位產生不良影響的機率?

np=27.6
變異數=4.61
P(X>32)
=1-P(X<31+0.5)
=1-P(Z<0.85)
=1-0.8023
=0.1977
=19%

2.假設某學校有30%之學生在校外賃屋，今由該校隨機抽取200名學生。試問其中有50人至70人(含50及70)在校賃屋之機率?

np=60
變異數=6.48
P(50<=X<=70)
=P((50-60)/6.48<Z<(70-60)/6.48)
=P(Z<=1.54)-P(Z<=-1.54)
=0.9382-0.0618
=0.8764
=87%

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