You have to add all the numbers together then divide it by how many numbers there are
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The mean of a set of data is the sum of that data divided by the number of items of data.
One reason I can think of why you might not be able to find the mean of numerical data would be if there were missing data points.
when there are extreme values in the data
Mean = (85+82+84+77+82+88)/6 = 498/6 = 83
If 0 is the smallest value in your data, then yes use zero to find the range.