Answer: The IQR is 4.
Explanation:
IQR stands for interquartile-range. To find the IQR, you subtract quartile 1 from quartile 3.
This is a dot graph. Each dot represents how many goals were won in each hockey game. In one game, 2 goals were shot. In 2 other games, 3 goals were shot... and so forth. Let's list how how many goals were won in each game:
2, 3, 3, 4, 5, 6, 7, 7, 11 - this is our list. Now, we need to find quartile one and three. In order to do so, we need to find the median.
Because our list contains an odd number of data, the median will be easy to find. It's the middle number which, in this case, is 5.
Quartile one goes from 2 to 4. Quartile three goes from 6 to 11. Now, we need to find the middle number of each quartile.
Quartile one's middle is 3. Quartile three's middle is 7.
7 - 3 is 4.