The lengths of pregnancies in a small rural village are normally distributed with a mean of 263 days and a standard deviation of 15 days. A distribution of values is normal with a mean of 263 and a standard deviation of 15. What percentage of pregnancies last fewer than 287 days? P(X < 287 days) = % Enter your answer as a percent accurate to 1 decimal place (do not enter the "%" sign). Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.