HW#10
 Due Friday, 10/19/07, hw10.cpp

(this problem is similar to p220 problem 3 in 
  Savitch, Absolute C++ 3rd Ed)

 Write a function that compute the standard deviation of an array of
 15 floats. Write your code such that you can change the number of
 floats by changing one variable.


You can use the following as a hint or small guide to your function:

 Your function should first compute the average. It should then
 compute the sum. Lastly compute and return the standard deviation as
 a float.