Mode refers to the most commonly recurring number. In this case, both 68 and 70 appear twice. So, this set has two modes.
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The range is 72 minus 66 = 6
71 is the median of those numbers.
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.