Chapter 13.3, Problem 50E

(a)

To determine

To calculate: The number research paper published by the researchers in European Union in the period shown in the graph by using left and right Riemann sum. Take subdivisions $n=5$, if the rate of research paper published by the researchers in the United States and the European Union for the period $1990-2010$ is represented by the graph,

(b)

To determine

To calculate: The value of ${\displaystyle \underset{0}{\overset{20}{\int }}n\left(t\right)dt}$, if the rate of research paper published by the researchers in the United States and the European Union for the period $1990-2010$ is represented by the graph,