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The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal with mean 266 days and standard deviation

The length of human pregnancies from conception to birth varies according to a distribution that is approximately normal with mean 266 days and standard deviation 16 days.

  • What is the z-score of a pregnancy lasting 240 days?
  • What is the z-score of a pregnancy lasting 292 days?
  • In 1945, a woman gave birth 375 days after conception. Is this normal? Explain why.

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