Chapter 5.1, Problem 36E

In the following exercises, graph the function then use a calculator or a computer program to evaluate the following left and right endpoint sums. Is the area under the curve between the left and right endpoint sums?

36. Let $d_j$ denote the hours of daylight and ${\delta }_j$ denote the

increase in the hours of daylight from day j - 1 to day j

in Fargo, Noith Dakota, on thejth day of the year. Interpret $d_1+{\displaystyle \underset{j=2}{\overset{365}{\sum }}{\delta }_j}$