## open data file
## slurp in lines from data file
## foreach your way through the data 
      ## print lines back to verify it was slurped.

##</code><code>##

## open data file
## slurp in lines from data file
## foreach your way through the data 
      ## parse the line into two scalars
      ## print the two scalars to verify parsing.

##</code><code>##

## open data file
## slurp in lines from data file
## foreach your way through the data 
      ## parse the line into two scalars
      ## stuff the two scalars into two arrays

## print the two arrays to verify stuffing.

##</code><code>##

## open data file
## slurp in lines from data file
## foreach your way through the data 
      ## parse the line into two scalars
      ## stuff the two scalars into two arrays

## sum all grades
## print the sum
## count the number of grades
## print the number of grades
## calculate the averate
## print the average