Refer to the Evolutionary Ecology Research (July 2003) study of the patterns of extinction in the New Zealand bird population, presented in Exercise 2.20 (p. 37). Consider the data on the egg length (measured in millimeters) for the 132 bird species saved in the NZBIRDS file.
a. Find the mean and standard deviation of the egg lengths.
b. Form an interval that can be used to predict the egg length of a bird species found in New Zealand.