Calculus and Above

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Data from the National...

Data from the National Vital Statistics System reveal that the distribution of the duration of human pregnancies (i.e., the number of days between conception and birth) is approximately normal with mean 270 and standard deviation 17 days. Use this normal model and a table of standard normal probabilities to determine the proportion of all pregnancies that come to term (have a duration) in the following number of days.Round your answers to four decimal places.

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. Less than 245 days (approximately 8 months).Entry field with incorrect answerb. More than 274 days (approximately 9 months).Entry field with incorrect answerc. More than 300 days.

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