bash - awk average in decimal -

i want write script gets average of 2 column of file first column equal, did awk. works, in output there exponential format data
121323e+2
changed print printf , added %f float

awk '     nr>1{         arr[$1]   += $2         arr2[$1] += $3         count[$1] += 1     }     end{         (a in arr) {              printf "%4.3f",  " " arr[a] / count[a] " " arr2[a] / count[a]         }     } ' t1.txt  > t2.txt 

i have problem part:

printf "%4.3f",  " " arr[a] / count[a] " " arr2[a] / count[a] 

• i want have enter after each printf line
• the spaces aren't exist in output

the output:

 0001204.0001125.0001118.0001053.0001046.0001039.000901.000822.000815.000808.000750 

which wanted

 0001 204.000 1125.000   1118.000 1053.000 1046.000   1039.000 901.000 822.000   815.000 808.000 750 

assuming rest of code want, should change printf this:

printf "%4.3f %4.3f %4.3f\n",  a, arr[a] / count[a], arr2[a] / count[a] 

here i've included 1 format specifier each value inserted , added newline \n end. each value separated commas.