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Although numerical integration is not exact, you might like to try to do a numerical integration which you KNOW is smaller than the mean and then do another integration which you can be very sure gives a value which is larger than the mean.
Don't forget that you can break an area down into rectangles or trapezia.
What's Your Mean?
Age 16 to 18
Challenge Level 
Although numerical integration is not exact, you might like to try to do a numerical integration which you KNOW is smaller than the mean and then do another integration which you can be very sure gives a value which is larger than the mean.
Don't forget that you can break an area down into rectangles or trapezia.