refactor run.sh to improve standard deviation calculation precision

    local avg=$(echo "scale=2; $sum / $count" | bc)

    # Calculate standard deviation

    local variance=0

    for value in "${values[@]}"; do

        variance=$(echo "$variance + ($value - $avg)^2" | bc)

    diff=$(echo "scale=2; $value - $avg" | bc)

    squared_diff=$(echo "scale=2; $diff * $diff" | bc)

    variance=$(echo "scale=2; $variance + $squared_diff" | bc)

    done

    local stddev=$(echo "scale=2; sqrt($variance / $count)" | bc)

    local stddev=$(echo "scale=2; sqrt($variance / $count)" | bc -l)

    echo "Average: $avg, Min: $min, Max: $max, StdDev: $stddev"

}