As shown, brand X has a smaller median compared to brand Y. If the interquartile range for brand x increases, the new graph is illustrated. More important that you understand that the interquartile range represents consistency of data. Similar to the standard deviation too. The smaller the value of interquartile range or standard deviation, the more consistent the result. Eg. You'll prefer to call a delivery service with the lowest median delivery time and smallest IQR or smallest standard deviation.