The average or mean of 3, 5, 7, 9, and 11 is 7.
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The arithmetic mean of a set of numbers is found by dividing the sum of all the numbers by how many numbers there are. In this case the arithmetic mean is: (8 + 7 + 7 + 5 + 3 + 2 + 2) / 7 ---> because there are 7 pieces of data. = 34 / 7 = 4.857 ( to 3 d.p.)
Arithmetic mean is simple averages of numbers that you have. e.g if you 4 numbers as 2,3,5,1 then arithmatic mean of these number is 2+3+5+1 divided by 4. so arithmatic mean for above numbers is 11/4=2.75
65.
The symbol for the arithmetic mean (average) of a group of numbers. The pronunciation is 'x bar'. If the set of numbers can be represented by (2, 3, 4, 4, 5), then the mean = (2+ 3+ 4+ 4+ 5)/5 = 3.6. So xbar = 3.6.