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How about something like this:
clear
reset
set key off
set border 3
set auto

set xrange[0:-100]
set xtics 5

# Make some suitable labels.
set title "Demo graph"
set xlabel "Value"
set...

Something like this?
awk '$3 && int($3)==$3 && $3<100' file

Just to expand on what vgersh99 said.

The offending part of your code is the "i++":


You increase the variable "i" two times for each record, so the $2 of the first line is stored in "t[0]",...

#!/usr/bin/awk -f
{
t[FNR]=$2 #only second and fifth field i want to extract
rssi[FNR]=$5
fnr=FNR
}
END {
for (i=1;i<=fnr;i++)
{
print t[i]
...