3) The length of human pregnancies from conception to birth varies on an approximate normal distribution with mean 266 days and a standard deviation of 6 days. Draw a normal curve below and mark three standard deviations out on either side. Then, use the curve to answer the following questions. a) How long are the longest 16% of pregnancies? b) How short are the shortest 16% of pregnancies? c) Between how many days does the middle 95% of all pregnancies fall? d) Between how many days does the middle 99.7% of all pregnancies fall? e) A pregnancy of 254 days corresponds to what percentile of pregnancies