Finish times (to the nearest hour) for 10 dogsled teams are shown

Finish times (to the nearest hour) for 10 dogsled teams are shown below:  Make a frequency table showing class limits, class boundaries, midpoints, frequency, relative frequencies, and cumulative frequencies.  Use three classes. (Round your answer for relative frequency to the nearest hundredth and for midpoint to the nearest tenth).

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a). 

Class limits               Boundaries            Midpoint      Freq      Relative Freq       Cumulative Freq

236 – 260                  235.5 – 260.5          248              4           0.44

261 – 284                  260.5 – 284.5          273              3           0.3                         7

285 – 308                  284.5 – 308.5          297              3           0.3                         10

b).

Class limits               Boundaries            Midpoint      Freq      Relative Freq       Cumulative Freq

236 – 260                  235.5 – 260.5          248              4           0.44

261 – 285                  260.5 – 285.5          273              3           0.37

286 – 310                  285.5 – 310.5          298              3           0.3                         10

c).

Class limits               Boundaries            Midpoint      Freq      Relative Freq       Cumulative Freq

236 – 260                  235.5 – 260.5          248              5           0.44

261 – 284                  260.5 – 285.5          273              5           0.3                         7

285 – 310                  285.5 – 310.5          297              4           0.3                         10

d).

Class limits               Boundaries            Midpoint      Freq      Relative Freq       Cumulative Freq

236 – 260                  235.5 – 260.5          248              5           0.44

261 – 284                  260.5 – 284.5          273              5           0.3                         7

285 – 308                  284.5 – 308.5          297              4           0.3                         10

e).  None of these choices