Ok the answer of 6 are 12, 18, 24, 30, 36, 42, and 48. The multiples of 9 are 18,27,36,45,54,63,72,81,90,99,108,117,126,135,144,153,162,171,180,189,198,. Hope it helps!
To find the IQR, you must: 1) Find the median 2) Split the data set in two at the median. 3) Find the medians from both the groups you made in Step 2 4) Label the smaller one Quartile 1 and the larger one Quartile 3 (Hint: The median is Quartile 2) 5) Subtract: Quartile 3 - Quartile 1