All organisms vary, even within a species and a habitat. A seedling growing in the shade will be likely to be taller than one in full sunshine. Animals in the same litter may have different masses depending on their genes and their food. An average quantity gives us a quick picture of what we are measuring. For instance, red foxes vary enormously in mass, from 2.2 to 14 kg, so looking at the individual mass of one fox tells us little. The average mass can be compared to other species, or averages within an area allow us to compare them from place to place. Foxes in Maryland average only 4.3 kg whereas in Scotland the average mass is 7.3 kg.
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Calculating arithmetic averages is the same in any situation. You calculate the sum of all the values and divide the total by the number of values.
That's because averages give us some idea about general tendencies.
The same way you calculate averages with whole numbers: Add up all the fractions and divide by the number of fractions there are.
The coordinates of the midpoint are the averages of the coordinates of the end points. So (0, 7.5).
The coordinates of the midpoint are the averages of the coordinates of the end points. So (0, 7.5).
averages in tests, bills, income, amount of time