Add all the sums, then divide by the number of sums. (ie. the average.)
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The arithmetic mean is calculated by adding together the values and dividing by how many values there are. This is distinct from the geometric mean which is calculated as the nth root of the product of the values where n is the number of values multiplied together.
the mean, also known as the average is calculated by adding up all the numbers together then dividing that by how many numbers you added together.
Mean is calculated by adding the numbers, then divide by the count of numbers.The count is 3 in this case. 15 + 10 + 15 = 40, so mean = 40/3 = 13.3333.....
in finance, unlike the arithmetic mean, the harmonic mean gives an equal weight to each data point that it reduces the weight of higher returns in calculating the average return. it's calculated as n/ (1/a + 1/b + 1/c ...)
The average mean is 14