Create u2-14.fooling_coverage.py

# SPECIFICATION:
#
# The stats function computes some basic statistics functions
# when given a list of numbers as input.
#
# TASK:
#
# Achieve full statement coverage on the stats function. 
# You will need to:
# 1) Insert a bug into the stats function.
# 2) Modify test1 so that it still achieves full test 
#    coverage, but does not trigger your bug. Depending 
#    on the bug you insert, you may not need to modify 
#    test1 at all.
# 3) Write test2 so that it also achieves full test 
#    coverage, but does trigger your bug.