Elephants have the longest pregnancy of all mammals. One species of elephant has a mean gestation period of 525 days and standard deviation of 32 days. Pregnancy length follows an approximately normally distribution. Use the 68%-95%-99.7% Rule to approximate each of the following. 10. Using the values given above, label the normal curve at the right with the numerical values for , U to, | + 20 and u + 30. 11. The longest 16% of all elephant pregnancies last at least how many days? 12. The middle 68% of all elephant pregnancies last between ............ and ............ days. 13. Only 2.5% of all elephant pregnancies last longer than ........... days. 14. What percent of elephant pregnancies last less than 461 days