Please someone help me with this ruby code on putty/emacs

Thanks

Write a statistical program in Ruby to:

a) Input the name of a data file from the command line arguments.

b) Input floating-point numbers from the data file.

c) Calculate and output the mean. This is the average, or the sum of

the

values divided by the number of values.

d) Calculate and output the median. This is the value such than half

the

values are larger and half are smaller. If you have an even number

of

values use either middle value or the average of the two middle

values.