Write a program which contains an internal function that returns
the standard deviation from the mean of
an array of real values.
Note that if the mean of a sequence of values 
is denoted
by m then the standard deviation, s, is defined as:
[Hint: In Fortran 90 SUM(X) is the sum of the elements of X.]
To demonstrate correctness print out the standard deviation of the following numbers (10 of 'em):
5.0 3.0 17.0 -7.56 78.1 99.99 0.8 11.7 33.8 29.6
and also for the following 14,
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0
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