Solutions to Lab 6
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1.
{print $5}
                                                                                
2.
NF==9 {print $5}
                                                                                
3.
NF==9 && /^-/ {print $5}
                                                                                
4.
BEGIN {
   sum = 0
   count = 0;
}
NF==9 && /^-/ {
   sum = sum + $5;
   count = count + 1;
}
END {
   print sum/count;
}