Answered: Here is the following code in C++ I…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Here is the following code in C++ I have for variance. I want the output to be 1.25 for the array of elements {3, 4, 1, 2} but instead, I am getting 2.

// Calculate Variance

int avg{0};
for (int i = 0; i < length; i++) {
avg += arr[i];
}
avg = (double) avg / length;

int variance = 0;

for (int i = 0; i < length; i++)
variance += (arr[i] - avg) * (arr[i] - avg);
return (double) variance / (length - 1);

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