For the data in Exercise 47, estimate the number of newborns whose weight was

a. less than 4105 grams

b. greater than 1492 grams

c. between 3234 and 4976 grams

Exercise 47 

A study conducted by the Center for Population Economics at the University of Chicago studied the birth weights of 621 babies born in New York. The mean weight was 3234 grams with a standard deviation of 871 grams. Assume that birth weight data are approximately bell-shaped. Estimate the number of newborns who weighed between

• 2363 grams and 4105 grams

• 1492 grams and 4976 grams