slon Hei Assume that the duration of human pregnancies can be described by a Normal model with mean 268 days and standard deviation 13 days. a) What percentage of pregnancies should last between 271 and 283 days? b) At least how many days should the longest 10% of all pregnancies last? c) Suppose a certain obstetrician is currently providing prenatal care to 57 pregnant women. Let y represent the mean length of their pregnand According to the Central Limit Theorem, what's the distribution of this sample mean, y? Specify the model, mean, and standard deviation. d) What's the probability that the mean duration of these patients' pregnancies will be less than 257 days? a) The percentage of pregnancies that should last between 271 and 283 days is (Round to two decimal places as needed.) %.

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Assume that the duration of human pregnancies can be described by a Normal model with mean 268 days and standard deviation 13 days.
a) What percentage of pregnancies should last between 271 and 283 days?
b) At least how many days should the longest 10% of all pregnancies last?
c) Suppose a certain obstetrician is currently providing prenatal care to 57 pregnant women. Let y represent the mean length of their pregnancie
According to the Central Limit Theorem, what's the distribution of this sample mean, y? Specify the model, mean, and standard deviation.
d) What's the probability that the mean duration of these patients' pregnancies will be less than 257 days?
a) The percentage of pregnancies that should last between 271 and 283 days is %.
(Round to two decimal places as needed.)
Transcribed Image Text:Question Help Assume that the duration of human pregnancies can be described by a Normal model with mean 268 days and standard deviation 13 days. a) What percentage of pregnancies should last between 271 and 283 days? b) At least how many days should the longest 10% of all pregnancies last? c) Suppose a certain obstetrician is currently providing prenatal care to 57 pregnant women. Let y represent the mean length of their pregnancie According to the Central Limit Theorem, what's the distribution of this sample mean, y? Specify the model, mean, and standard deviation. d) What's the probability that the mean duration of these patients' pregnancies will be less than 257 days? a) The percentage of pregnancies that should last between 271 and 283 days is %. (Round to two decimal places as needed.)
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