Physics: guesstimate or approximation

​It is good to deal with exact numbers in physics, however it is not always possible to do so. Sometimes we don’t have enough information and we need to deal with approximate numbers.

For example average speed of a walking person according to Google is anywhere from 2.5 to 4.0 mph.

It can be averaged to 3 mph. Average is a sum of all numbers divided by the count of these numbers,

Similar to average is a mean number. Mean number is the middle number in the ordered sequence of numbers, Average and mean numbers have different meanings, even so their values maybe same.

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