The range is 72 minus 66 = 6
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71 is the median of those numbers.
Mode refers to the most commonly recurring number. In this case, both 68 and 70 appear twice. So, this set has two modes.
to find the mean of a group of numbers, add them together and divide by the number of numbers there are in that group. in this case there are 6
62 64 66 68 70 72
65, 66 67 68 and 69 can all be numbers to be rounded to 70.