If the graph is increasing on the interval, then the left-sum is an underestimate of the actual value and the right-sum is an overestimate. If the curve is decreasing then the right-sums are underestimates and the left-sums are overestimates.

Furthermore, what is a left Riemann sum? Given a partition of the interval , the left Riemann sum is defined as: where the chosen point of each subinterval of the partition is the left-hand point . • By default, the interval is divided into equal-sized subintervals.

Keeping this in consideration, why do we use Riemann sums?

In mathematics, a Riemann sum is a certain kind of approximation of an integral by a finite sum. This approach can be used to find a numerical approximation for a definite integral even if the fundamental theorem of calculus does not make it easy to find a closed-form solution.

What is N in Riemann sum?

A Riemann Sum is a method for approximating the total area underneath a curve on a graph, otherwise known as an integral. We can calculate the value of a definite integral using a calculator or software and letting n be some large number, like 1,000.