Postage Stamps (Historic) The table gives the number of European, North American, an...

Postage Stamps (Historic) The table gives the number of European, North American, and South American countries that issued postage stamps from 1840 through 1880.

a. Find a logistic model for the data.

b. Estimate the location of the inflection point.

c. Indicate where the curve is concave up and where it is concave down.