26
19
23
15
20
29
16
21
25
30
18
The median of this set of numbers is 21.
inter quartile
To find the interquartile range (IQR), we first need to find the first quartile (Q1) and the third quartile (Q3).
First, let's sort the numbers in ascending order:
15, 16, 18, 19, 20, 21, 23, 25, 26, 29, 30
Next, we need to find the median of the lower half of the data (Q1) and the median of the upper half of the data (Q3).
Q1 = median of the lower half = median of (15, 16, 18, 19, 20) = 18
Q3 = median of the upper half = median of (23, 25, 26, 29, 30) = 26
Now, we can calculate the IQR:
IQR = Q3 - Q1
IQR = 26 - 18
IQR = 8
Therefore, the interquartile range (IQR) of the given data set is 8.