I have been having some trouble solving a specific problem asking to find the mean and standard deviation of a population when given two equations with sigma (see attached)
My attempt was to find x so that x + (x+1) + (x+2) + ....... + (x+24) = 300. So 25x + 300 = 300... wait... then x is zero...
Am I doing it wrong? please explain this to me I'm lost :S
Also, how is it possible to get the standard deviaiton from such equation?
Please don't leave comments like "go back to your textbook", I have and it says nothing about this...
Thanks in advance