No brandA brandB population
  1   17.4   14.8        144
  2   13.2   14.4        184
  3   11.5   20.3        157
  4   15.1   10.2        168
  5   20.3   12.1        199
  6   10.1   17.6        133
  7    5.8   24.7        125
  8    5.7   28.0        101
  9    7.4   27.8        138
 10   26.4   17.5        330
 11   17.6   26.2        195
 12   27.5   24.7        368
 13   24.2   22.5        361
 14   19.4   35.3        208
 15   16.3   30.2        188
 16   14.2   33.8        178
 17   25.8   30.6        333
 18   26.3   31.2        329
 19   34.5   37.5        408
 20   31.4   40.6        410
 21   42.2   27.4        594
 22   37.5   19.6        441
 23   30.1   34.2        409
 24   39.7   45.5        550
 25   30.4   37.5        468
 26   27.3   49.1        370
 27   38.0   40.3        437
 28   41.2   38.2        546
 29   24.5   38.4        337