By Long Multiplication
19
x12
190
38
228
====_
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152 / 8 = 19
The mode is the number that most often occurs. As both 19 and 22 occur three times, then there is no mode.
The median of {10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] is the 6th values which is 15.
The mean is the sum of the values divided by the number of values. In this case (12+10+19+8+2+15+1+20+6+11+3+7)/12 = 9.5.
The range is 12 and the standard deviation is 3.822448314.