Summary statistics (variable X)
> summary(x)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
  153.0   162.8   169.0   169.2   175.2   190.0
Summary statistics (variable Y)
> summary(y)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
  138.0   157.0   165.0   165.3   175.0   186.0