weight    sex  age 
   5.311580   male   1
   7.340586   male   2
   6.561460   male   3
  10.151011   male   4
   9.976946   male   5
  12.076808   male   6
  13.341954   male   7
  14.393294   male   8
  17.346675   male   9
 20.495888   male  10
  3.720102 female   1
  3.386025 female   2
  4.883829 female   3
  6.670705 female   4
  5.791259 female   5
  8.167242 female   6
  8.487023 female   7
 10.171593 female   8
 10.646432 female   9
 12.529773 female  10