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Assume that the duration of human pregnancies can be described by a Normal model with mean...

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

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