Calculus with Data in a Table

Question

The table of values below shows the rate of oil consumption in gallons per minute at selected time intervals from t = 0 to t = 12.
Using a left Riemann sum with 5 subintervals estimate the total amount of oil consumed in that time interval. Give your answer correct to 1 decimal place.

x     0     2    5     7    11   12
f(x)  7  4.0  3.2  2.2  1.6    1 

Answer 1

Left sum=2*7+3*4+2*3.2+4*2.2+1*1.6=42.8