The box plot with the horizontal axis contains the markings “B R O” and “B R O P S O” from left to right. The vertical axis of the graph is labeled “Cost Function”, and ranges from 320 to 355 with an increment of 5 units. The data values in the bars are as follows: B R O: Lower Quartile: 338. Median: 350. Upper Quartile: 353. Minimum: 339. Maximum: 351. B R O P S O: Minimum: 322. Maximum: 322. Note: All numerical data values are approximated.
Chart box of solved 9 m castellated beam. Source: Authors' own work