Question: how to calculate the interquartile range?
Answer: Step 1: Put the numbers in order. ... 
Step 2: Find the median. ... 
Step 3: Place parentheses around the numbers above and below the median. Not necessary statistically, but it makes Q1 and Q3 easier to spot. ... 
Step 4: Find Q1 and Q3. ... 
Step 5: Subtract Q1 from Q3 to find the interquartile range.