RESEARCH METHODOLOGY

Detailed explanation-1: -To calculate the variance, you first subtract the mean from each number and then square the results to find the squared differences. You then find the average of those squared differences. The result is the variance.

Detailed explanation-2: -In statistics, variance measures variability from the average or mean. It is calculated by taking the differences between each number in the data set and the mean, then squaring the differences to make them positive, and finally dividing the sum of the squares by the number of values in the data set.

Detailed explanation-3: -The variance is defined as the expected value of the squared difference between the random variable and its mean. Without finding its mean, you cannot find its variance or standard deviation.