The continuous function f is defined on the interval 0≤x≤4. The table gives the values of f at each integer value of x.
x: 0 1 2 3 4
f(x): 2 4 3 7 8
Which of the following is the best numerical estimate of the average value of f on [0,4]?
a) 5.50
b) 4.80
c) 4.75
d) 4.00