This is because the average of the ratios does not take account of the sizes of the numbers in the ratios.
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The mean of a series of numbers is the average - calculated by added all the numbers in the series and dividing the sum by the number of numbers in the series. Given the set of numbers {1,2,3,4,5}, the sum of these numbers [1+2+3+4+5=15] divided by 5 {n=5}, gives a mean or average of 3.
That's called the average.
To get the simple average of a series of numbers, you add the numbers up and divide by however many numbers there were. For example, the average of 2, 3 and 4 is the sum of the numbers (which adds up to 9) divided by 3 (because there are three numbers). So the average is 9/3 = 3.
The mean is the same as average. You would get this by adding all the numbers up and dividing by the total number of numbers in the series. Ex. For [1,4,6,9] the mean is 1+4+6+9 = 20 / 4 = 5
The average of a series of numbers is their sum divided by however many numbers there are: in this case you would calculate: (16 + 40) / 2 =56 / 2 =28 Therefore the average of 16 and 40 is 28.