Computing Average and Writing to Measurement File

Hi, 

I'm new to labview and I was hoping to get some guidance and would appreciate any help or advice I could get. 

I am trying to configure a code that'll calculate the average of numbers that I'll manually input into an array, then using the measurement to file function to export it to an excel sheet. 

I was thinking of creating an array to input my numbers then using the mean.vi function to calculate the average?

I want to test out the code by manually inputing numbers, but my final project consists of a DAQ retrieving data and wiring through a sample compression, then from there, taking averages of the numbers from the sample compression at X time then exporting that data. 

Any advice? 

Thanks in advance!