A manufacturer of network computer server systems is interested in summarizing the extent of customer problems in terms of system downtime. The 16 most recent customers were surveyed to determine the amount of downtime (in hours) they had experienced during the previous month. These data are listed in the table.

Customer Number 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
Downtime (hours) 8 7 25 9 8 6 9 11 7 18 12 16 11 18 12 10

a. Construct a box plot for these data.