1. The problem statement, all variables and given/known data Consider a gaussian graph let 5 quares on y -axis represent 1units 2. Relevant equations is it correct for me to say that the average value of the quantity on the y-axis is given by y_av = (y_min + y_max) / 2 where y_min is smallest value of y in the graph = 0 y_max is the maximum value of y in graph = 2.4 average value of y, y_av = (0 + 2.4) /2 = 1.2 3. The attempt at a solution then, to find the area under graph, i use area = y_av * (3 - -3) = y_av * 6 = 7.2 is this correct or wrong. in the above, i have all the things that i would if this was a question. am i missing an assumption. the answer seems correct but is the method correct. note that at this a-level, i dont have to know equation of gaussian graph nor do i do integration. is this the correct way to find area under graph for non-linear graphs?? is there a general formula (not integration) for lower levels?