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Among women who give birth at home, the length of their pregnancies have an approximately normal...

Among women who give birth at home, the length of their pregnancies have an approximately normal distribution with a mean of 270 days and a standard deviation of 5 days. Use this information to answer the following:

a.) Approximately what percentage of homebirth pregnancies last between 260 and 280 days?

b.)Approximately what percentage of homebirth pregnancies last between 255 and 270 days?

c.) Approximately what percentage of homebirth pregnancies last less than 265 days?

Math   Statistics-And-Probability   
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