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Assume that the duration of human pregnancies can be described by a normal model with mean 269 days and standard deviation 18
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Ans gn In Normal distribution first we calculate the zo score with the below formula Z=x-M offer calculating the Z-score, wit

The from the 2-table below find the probability value corresponding to a Z-value of -0.22, 7 probability value is 0.4129 LetNumber in the table represents PIZsz) z0 UUUT ，0.000.01 0.020.030.040.050.060.070.080.09 3,6 |.0002 .0002 .0001 .0001 .0001 .

Number in the table represents P(Z<z) 。 z | | ༴ ཀླུ ༔ ༔ ༔ ༔ ཀྵ = ཀྵ ཀྵ བྱཱ ཀྵ ཀྵ བྱཱ ཀྵ བསྶཀྑ .9222 .9265 0.00 0.01་ 0,020.03

x=265 M = 269 x= 280 The total area under the normal curve above represents the total probability which is equal to 1. The ar

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