The mode is the data set element(s) that is(are) repeated the most.
If every data set element occurs the same number of times, there is no mode.
As there is only one occurrence of each data set element in {11, 12, 13} there is no mode.
If your data set read {11, 12, 12, 13, 13, 12} your mode would be 12.
If your data set read {11, 12, 12, 13, 13} your modes would be 12 & 13.
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That set has no mode.
what is the mode of the following data 18, 17, 12, 14, 8, 21, 10, 11, 19, 20, 10, 5, 17, 12, 10, 20
One possibility: 5, 6, 7, 7, 7, 12, 12, 13, 14, 15, 16, 18
The mean is the average. For example if you had the numbers 11, 10, 12, 11, 7, and 15. You would add them up and divide by how many numbers there are (which in this case is 6). The number you get is your mean (in this case the means in 11).The mode is the number that occurs most often. Using the same set of numbers above (11, 10, 12, 11, 7, and 15), the mode would be 11 because that's the only number that occurs the most. In other words, there is more than one of the same number.
10 appears more times than any other number, so it is the mode.