88.This integral is referencing
the average value of a function.
means we are looking for a function where the average value of the function
could possibly be equal to 1. Another way to look at this integral
would be think of it in terms of area. The area of the region bounded by
x=2,x=4, the graph, and the x-axis would have to be 2.
If a triangle were superimposed over the graph whose vertices were at
(2,0), (3,2), and (4,0) the area of the triangle would be 2 so that tells us
that the area of the given region in graph A is greater than 2. This
suggest that this function has an average greater than 1.
Similarly f a triangle were superimposed over the graph whose vertices
were at (2,0), (3,2), and (4,0) the area of the triangle would be 2 so that
tells us that the area of the given region in graph B is less than 2.
This would lead to an average less than 1.
It is impossible for the average value of the function to equal 1 in
graphs D and E.
Calculating the definite integral for graph C
yields an area of exactly 2 so this graph would have an average value of 1.
--Answer C