## Lab 6

In this lab, you will write a program that will read numeric data from a text
file and calculate the mean and the standard deviation. You will use void
functions for the input and output and value-returning functions for the mean
and the standard deviation.

### Output Specifications

Display the description of a set of numeric data, the mean of the data
values, and the standard deviation of the data values. Here is a sample run:

### Input Specifications

The data is read from an input file whose name is specified by the user. The
first line of the file contains a description of the data. The data is stored
beginning on the second line and is white-space delimited (there is white-space
between each data value and the next). The number of values is not known ahead
of time. Here is a sample file:

SAT Math Scores
700
600
450
660
750

### Process Specifications

Calculate the mean (x-bar) and standard deviation (s) of the data using these
formulas:

### Miscellaneous
Specifications

Your program should include a void function whose only purpose is to read the
data file, determine the number of data values, and find the required sums (the
sum of the values and the sum of the squares of the values).

Note, a stream parameter (input stream or output stream) should be passed
by address because it serves as an in/out parameter. It serves as an in
parameter because the function needs the stream in order to do anything with
it. It is an out parameter because when the function does something with the
stream, it modifies the state of the stream and that modified stated must be
passed back to the invoking routine.

Your program should include a value-returning function whose sole purpose is
to calculate the mean given the number of values and the sum of the values.

Your program should include a value-returning function whose sole purpose is
to calculate the standard deviation given the number of values, the sum of the
values, and the sum of the squares of the values.

Your program should include a void function whose sole purpose is to display
the program output.

I've started the program for you in the file
Lab06.cpp.
This file will not compile successfully until you have at least skeleton
versions of each of the needed functions. You are not to make any modifications
to my code. Just add your code. Don't forget to complete the header comments
for each function by adding parameter usage comment(s).