Mean Value Theorem
Why doesn't it hold if the function isn't differentiable?
Well, because if a function is not differentiable then there is no meaning of f'(c) that for some c is meant to equal (f(b)-f(a))/(b-a) - so how can the theorem hold in the case that f'(c) does not exist - at least not everywhere?
finding the mean on frequency charts
can you explain how to find the mean of a frequency chart using (x f and fx) with three colums in a chil friendly way !