How to average the performance results of several runs on a particular command in Bash

averagePerformance.sh

#!/bin/bash

numberOfRuns="10"

i="0"

while [ $i -lt ${numberOfRuns} ]
do
	results[${i}]=`./performanceTest` # Replace ./performanceTest with the command line of the test you want to run. 
	# ^ This assumes that the result of the test will be a number (integer or decimal).
	echo "Result this run: ${results[${i}]}"
	i=$[$i+1]
done

resultTotal="0"

for thisResult in "${results[@]}"
do
	resultTotal=`echo "${resultTotal}+${thisResult}" | bc`
done

average=`echo "scale=4;${resultTotal}/${numberOfRuns}" | bc` # "scale" controls the decimal places used for the division calculation.

echo "The average is: ${average}"