CS506 Web Design and Development Assignment No. 01 SEMESTER Fall 2011 Idea Solution

Question:                                                                       

Write a program that computes the average and standard deviation of the text floating point numbers in a file. Use the following formulas for the average and the standard deviation of N values. The formulas compute the sum, the sum of squares, the average, the average square, the variance, and finally, the standard deviation.

sum = x₁ + x₂  + x₃ + ... + x_N-1 + x_N

sumSQ = x₁² + x₂²  + x₃² + ... + x_N-1² + x_N²

avg = sum/N

avgSQ = avgSQ/N

var = avgSQ - avg²

sd  = var^(1/2)

The input file will contain any number text floating point numbers, similar to the following:

10.5

12.9

9.67

12.05

8.23

10.08

10.23

7.7

10.4

11.34

Numbers could be several, or none per line, and negative numbers are perfectly OK.

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