>>What is the difference between mean and average?
>
>According to my dictionaries, there's no difference.
>
>Vlad
In a distribution of 'n' measurements, the (arithmetic) mean or
'average' is the sum of the measurements divided by 'n'. The 'median' is the middle measurements after the measurements are ordered by size
if 'n' is odd, or the mean of the middle measurements if 'n' is
even. Thus, for the measurements 70,72,72,76,78 and 81 the
mean is 450/6 = 75, the median is (72+76)/2 = 74
HTH
good luck