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The first step is to add the three numbers that is, 3 + 7 + 8 + 6 = 24.
The value of the addition is 24.
No. Of quantities in the set = 4.
Therefore, the mean is 24/4 = 6.
The first step would be to sort them in increasing order that is, 3, 6, 7, 9, 12.
The middle number is 7.
With odd rule, the median is 7.
Sorting the set in increasing order, we get, 3, 5, 6, 10, 11, 15
The two middle number are 6 and 10.
Sum of those two numbers = 6 + 10 = 16.
Dividing the value by 2, we get, 16/2 = 8.
Therefore the median is 8.
Sorting the numbers we get, 1, 1, 4, 6, 6, 6, 7, 9.
6 is the mode as it has appeared the most number of times.
The largest number in the set is 26 and the smallest number is 2.
Therefore, the difference is 26 – 2 = 24.
The range is 24.