Scientists discovered a new group of proteins in an animal species. They found that the distribution of the number of amino acids these proteins were made of was approximately Normal with mean 530 and standard deviation 80. About what percent of these new proteins will be between 370 and 690 amino acids long?

The gestation period for cats has an approximate mean of 64 days and a standard deviation of 3 days, and the distribution of the gestation period has an approximate Normal distribution. What proportion of kittens are born between 61 and 67 days after conception?

The gestation period for cats has an approximate mean of 64 days and a standard deviation of 3 days and the distribution of the gestation period is approximately Normal. What proportion of kittens have a gestation period longer than 70 days?