The lengths of pregnancies in a small rural village are normally distributed with a mean of 270 and a standard deviation of 15 days. In what range would we expect to find the middle 50% of most...

The lengths of pregnancies in a small rural village are normally distributed with a mean of 270 and a standard deviation of 15 days. In what range would we expect to find the middle 50% of most lengths of pregnancies? Round the answer to one decimal place