Question

What is the interquartile range of the data set?

Answer 1

The interquartile range (IQR) is a measure of variability, based on dividing a data setinto quartiles. Quartiles divide a rank-ordered data set into four equal parts. The values that divide each part are called the first, second, and third quartiles; and they are denoted by Q1, Q2, and Q3, respectively.

Answer 2

20,25,30,30,31,40,41,49
Q1 = (25+30)/2 = 27.5
Q3 = (40+41)/2 = 40.5
 Q2=inter-quartile range = Q3 - Q1 = 40.5 - 27.5 = 13

answer is 13