CSE 1502 Spring 2005
Introduction to Software Development with C++
Instructor: Venkatesh Ramamoorthy
Assignment 3 (Turn in by FRIDAY 04-Mar-2005)
1. Write a program which inputs N followed by a set of N integers {x1, x2, x3, ... xN}, and
outputs the average A and the variance V of the set, given by:
∑ xi
A =
N
∑ xi2 – NA2
V =
N – 1
where the sum ∑ takes on the numbers from x1 to xN.
Inputs
•The number of integers N. Your input prompt should appear as “Enter the
number of integers:”
•The N integers, x1, x2, x3 … xN. In order to read each of these, your input
prompt should repeatedly appear as: “Enter integer”. Each input prompt
should appear on a new line.
Validations
•Can you figure out what validations should be done on each input listed
above?
Outputs
•Your outputs A and V should appear along with the following prompts:
Average = (average)
Variance = (variance)
For example, if the average is 100 and the variance is 2.75, then these outputs
should appear as follows:
Average = 100
Variance = 2.75
Test Values
•For a sample of 10 observations, namely, {40, 83, 48, 61, 40, 45, 42, 44}, the
average A should display 50.375 while the variance should display 219.70.
