Rearranging the numbers given in ascending order:
12, 23, 32, 39, 45, 65, 76, 87
n = 8
Now,
Minimum = smallest number = 12
First quartile:
C = n/4 = 8/4 = 2
Since C is an even number, First quartile = (C+1)th number. That is;
First quartile = (2+1)th number = 3rd number = 32
Median:
Median is the [(n+1)/2)]th number.
(n+1)/2 = (8+1)/2 = 4.5
Averaging the two middle numbers = (39+45)/2 = 42
Therefore, median = 42
Third quartile:
Third quartile Cth number = 3n/4th number = 3*8/4 = 6th
But C is even number
Therefore, Third quartile =(C+1)th number = (6+1)th number = 7th number = 76
Maximum number = largest number = 87