I need help answering this question.

Assume that the duration of human pregnancies can be described by a ncrrnal model with mean 263 days and standard deviation 14 days. Complete parts a} through d) below. a} What percentage of pregnancies should last between 2?5 and 230 days? .93 {Round to one decimal place as needed.) b} At least how many days should the longest 25% of all pregnancies last? PD: 2 CI} = 0.25 {Round to one decimal place as needed.) c} Suppose a certain obstetrician is currently providing prenatal care to 20 pregnant women. Let y represent the mean length of their pregnancies. According to the central limit theorem. what is the mean and standard deviation SDiy] of the normal model of the distribution of the sample mean, y? The mean is D. SDiy] = D {Round to two decimal places as needed.) d} What is the probability that the mean duration of these patients' pregnancies will be less than 262 days? my -: 262] = D {Round to three decimal places as needed}