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To find the mean you first have to add up all the numbers then you divide it by how many numbers you have and you got the mean. Example: 12+13+5=30 30/3=10 10 is the mean
It is: 10+25+30+35 = 100 and 100/4 = 25 which is the average mean value
If you mean MMXXI then it is the equivalent of 2021
39.8
Add them up and then divide by how many numbers there are . Example 2+4+6+8+10=30 (5 numbers).(total) 30 divided by 5 (total numbers) = a mean of 6.