Interquartile range of 62, 63, 63, 70, 73, 70, 79, 83, 84, 90,91

21

Step-by-step explanation:

1. Sort your numbers

Sorted = 62, 63, 63, 70, 70, 73, 79, 83, 84, 90, 91

2. Calculate Q2

Q2 = median = middle number of set

You have eleven numbers in the set, so the median is the sixth number.

Q2 = 73

3. Calculate Q1

Q1 = median of all numbers below Q1.

You have five numbers in the set, so the median is the third number.

Q1 = 63

4. Calculate Q3

Q3 = median of all numbers above Q1.

You have five numbers in the set, so the median is the third number above Q2.

5. Calculate IQR

IQR = Q3 - Q1 = 84 - 63 = 21

The interquartile range is 21.