The lengths of pregnancies are normally distributed with a mean of 272 days and a standard deviattion of 20 days. If 64 women are randomly selected, find the probability that they have a mean pregancy between 272 days and 274 days

Just a quick question.

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Use your knowledge of the Normal Distribution Curve.

Convert your values to the z value, and look up in your z table for the probabilities. Make a sketch of the curve to make sure that you are looking for the right area.