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2. The length of human pregnancies from conception to birth varies according to a normal distribution with mean 272 days and
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a@ μ: 272 , 6.ะเ, 즈쓰-ra, 2-232. Ζ: しら P290 S- 3 P(z4-1.13) P(> 1.13): 0.5-P02 41.13) 1-13 Z-1.13

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