In: Statistics and Probability
Assume that the duration of human pregnancies can be described by a Normal model with mean 266266 days and standard deviation 1818 days. a) What percentage of pregnancies should last between 268268 and 276276 days? b) At least how many days should the longest 3030% of all pregnancies last? c) Suppose a certain obstetrician is currently providing prenatal care to 6868 pregnant women. Let y overbary represent the mean length of their pregnancies. According to the Central Limit Theorem, what's the distribution of this sample mean, y overbary? Specify the model, mean, and standard deviation. d) What's the probability that the mean duration of these patients' pregnancies will be less than 262262 days? a) The percentage of pregnancies that should last between 268268 and 276276 days is nothingm%. (Round to two decimal places as needed.)
Please help me solve this with ti-84 calc