Shell Programming and Scripting

I've got a csh routine that spits out a file with nothing but numbers - one per line. I'd like to be able to add to the script a routine which total all the lines in the file and then produce an average value. I currently have it calling a ksh script to do the work, but would like to keep it all within the one csh script. Don't know it it matters, but the list of numbers is between 50000 and 70000 lines.

Code:

awk '{sum += $0} END {print "total :", sum, "average : ", sum / NR }' filename