# Is it possible to calculate the regular average of a sequence of numbers when i dont know everything of the sequence, but just everytime i get a new number i know the total count of numbers and the average for the numbers - 1. For example: 2, 3, 10 the average is of course: 5 But in the last step to calculate i only have access to the previous average of 2 and 3: 2,.5 the next number: 10 and the count of numbers: 3 If this is possible, how?

Is it possible to calculate the regular average of a sequence of numbers when i dont know everything of the sequence, but just everytime i get a new number i know the total count of numbers and the average for the numbers $-1$.
for example: $2,3,10$ the average is of course: $5$
but in the last step to calculate i only have access to the previous average of $2$ and $3:2.5$ the next number: $10$ and the count of numbers: $3$
if this is possible, how?
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broeifl
A very simple thought process results in the same formula for running average. If you have $N$ previous measures (of course the measures could all be different) the average you calculate is exactly the same as if all measures were the same as the computed average value. Then, computing the running average of the $N+1$ is equal to $N$ times the previously computed average plus the $N+1$ measure all divided by $N+1$.