Accumulation and Riemann sums:

The following table gives the estimated rates of increase in electrical energy consumption in Mexico, from 2015 to 2025:

YEAR	ESTIMATED CONSUMPTION (GWH/ YEAR)
2015	250,000
2017	254,104
2019	300,000
2021	327,000
2023	372,279
2025	379,000

a) Make a sketch of the graph that represents the data in the table. Remember to label their axes and note the title of the graph.

b) Calculate the total energy consumption in these ten years. Choose the consumption rate at the end of each two-year interval.