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Assume that the lengths of pregnancy for humans are approximately Normally distributed, with a mean of 267 days and a standard deviation of 10 days. Use the Empirical Rule to answer the following questions. Do not use the technology or the Normal table. Begin by labeling the horizontal axis of the graph with lengths, using the given mean and standard deviation. Three of the entries are done for you. Complete parts (a) Density through (f) below. Z -3 -2 0 2 Length 257 267 277 . ... . b. Roughly what percentage of pregnancies last between 267 and 277 days? O 17% O 34% O 50% O 2.5% c. Roughly what percentage of pregnancies last less than 237 days? O about 0% O 34% O almost all O 50%