The difference between 2 consecutive x values =x₂ - x₁ = Δ(x)
Notice that the difference of x₂- x₁ = 25, (scale of the small rectangles)
Then 25 =(x₂ - x₁) = length of the small rectangles & the width is given by the related f(x), So the area of each small rectangle is:
W.L ==> 25 . f(x)
Area 1st Rectangle =0.022 (Given)
Area 2nd Rectangle =25.(0.00054) =
Area 3rd Rectangle =25.(0.000317) =
Area 4th Rectangle =25.(0.000175) =
Area 5th Rectangle =25.(0.000091) =
Area 6th Rectangle =25.(0.000044) =
Use your calculator & add up the 6 area to find the solution. (don't forget to round to 3 decimals