The average is the sum of all of the numbers in a data set DIVIDED by the number of numbers in the data set.
Therefore, given the following set of numbers
5 5 7 8 10
The average would be (5 + 5 + 7 + 8 + 10) / 5 which will give you 7. so the average is 7
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You cannot work out pheta until it is defined.
Physics requires maths, to work out the force of something. and for example if you have the time it takes an item to arrive as well as the distance you can work out the speed