{total+=$1; totalp2+=($1)*($1)}
END{if (NR==0) {avg=0; std_err=0} 
    else { 
      avg=total/NR; 
      std_dev=sqrt((totalp2-total*total/NR)/(NR-1)); 
      std_err=std_dev/sqrt(NR)
	} 
      printf("\t%s\t%s\n",avg,std_err) }