BEGIN{
freq[1]=611
freq[2]=955
freq[3]=955
freq[4]=1306
freq[5]=1443
freq[6]=1443
freq[7]=2973
freq[8]=3056
freq[9]=3056
i=1
}

{
ch3br[i]=$1
i++
}

END{
for(i=1;i<10;i++){
	sum = sum + (freq[i] - ch3br[i])**2
  }
printf("%3.1f \n", sqrt(sum/9))
}