Pregnancy Durations 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. a. Less than 247 days (approximately 8 months). b. More than 272 days (approximately 9 months). c. More than 300 days. d. Between 260 and 280 days.

MATLAB: An Introduction with Applications
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**Unit 3, Topic 12, Exercise 12-06**

**Pregnancy Durations**

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 a mean of 270 and a standard deviation of 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.

a. Less than 247 days (approximately 8 months).

[Text box for answer input]

b. More than 272 days (approximately 9 months).

[Text box for answer input]

c. More than 300 days.

[Text box for answer input]

d. Between 260 and 280 days.

[Text box for answer input]
Transcribed Image Text:**Unit 3, Topic 12, Exercise 12-06** **Pregnancy Durations** 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 a mean of 270 and a standard deviation of 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. a. Less than 247 days (approximately 8 months). [Text box for answer input] b. More than 272 days (approximately 9 months). [Text box for answer input] c. More than 300 days. [Text box for answer input] d. Between 260 and 280 days. [Text box for answer input]
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