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Suppose that the lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 14 days. Complete the following statements. (a) Approximately 95% of pregnancies have lengths between D days and D days. (b) Approximately ? v of pregnancies have lengths between 226 days and 310 days. The following are the lengths of stay (in days) for a random sampl_e of 19 patients discharged from a particular hospital: 13, 9, 5,11, 6, 3,12,10,11, 7, 3, 9, 5, 2, 2, 2,10,10,12 Send data to calculator Draw the histogram for these data using an initial class boundary of 1.5, an ending class boundary of 13.5, and 6 classes of equal width. Note that you can add or remove classes from the gure. Label each class with its endpoints. Frequency 6 5 4 3 2 1 T