Add all the marks up and divide by 20 to get the average !
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add up the three grades then divide by three
The first running average is the first grade. The second running average (RA) is the average of the first two grades, the third RA is the average of the first three grades and so on.
20+23 = 43 and 43/2 = 21.5 which is the mean average
The average is 31.5
To find the average you need to add the two numbers together and divide by two. 18 + 22 = 40 40 / 2 = 20 The answer is 20.