A friend sent me a nice collection of exercises about which I will talk soon on this blog. One of the questions is simply:

Calculate the mean value of sin100(x) with a precision of 10%.

I suppose that one must understand calculate the mean value on an interval having the length of a period (for example between 0 and pi).
According to the author of the list of exercises a student who is unable to solve this problem within five minutes does not master mathematics at all... What about you? :-)

To close this entry here are two nice math sentences:

To speak algebraically, Mr. M. is execrable, but Mr. G. is (x+1)ecrable. — Edgar Alan Poe
Even the strongest number needs its zeros: 100000000.
— Zarko Petan