What is the median of the following data set?
3, 15, 18, 20, 21, 28, 31, 31, 35, 35
A)24.5
B)24
C)0
D)25.5
The median is the middle value of a data set when it is ordered from least to greatest.
When the data set is ordered:
3, 15, 18, 20, 21, 28, 31, 31, 35, 35
There are 10 numbers in the data set, so the median will be the average of the two middle numbers which are the 5th and 6th numbers.
The 5th number is 21 and the 6th number is 28.
Therefore, the median is (21 + 28) / 2 = 24.5
So, the correct answer is A) 24.5.