Use a fiNite Sum to Estimate the Average Value of the Function

Use a finite sum to estimate the average value of the function on the given interval by partitioning the interval and
evaluating the function at the midpoints of the subintervals.
- $f ( t ) = 1 e ^ { - t } \cos 2 \pi t$ on $[ - 2,3 ]$ divided into 5 subintervals (Round to the nearest hundredth.)

A) $- 7.41$
B) -19.14
C) $1.41$
D) -1.41