Thirty identical flashlights were loaded with newly purchased alkaline AA batteries. Ten of them contained Duracell, ten contained Energizer, and ten contained Rayovac brand batteries. The flashlights were turned on and placed on a bookshelf where a time-lapse video camera captured how long (in minutes) each beam of light lasted. These times are displayed in the following table.

Brand Time (in minutes) of Flashlight Continuous Use with New Alkaline AA Batteries Duracell 244 241 236 239 240 237 243 251 245 232 Energizer 231 240 236 243 246 249 238 247 236 240 Rayovac 178 184 185 167 183 191 166 185 171 182