Answer C
The third quartile, denoted by Q3 , is the median of the upper half of the data set. About 75% of the numbers in the data set lie below Q3 and about 25% lie above Q3 .
steps to find Q3:
1- arrange given data in ascending order
80 85 105 105 140 144 152 160 165
2- find median
140
values to the left of median are called lower half
values to the right of median are called upper half
3- find median of upper half to find Q3
(152+160)/2 = 156
Q3 = 156
