Data Analysis using descriptive statistics .. For Descriptive statistics we used different types of techniques to verify the distribution and variability of data Means, Median and mode are three function use for the descriptive statitics Mean is just average of data (sum of data /devide by total number) Media is middle number of data in case of even data just take the average of the middle numbers. Mode is just the numbers which is frequently used in data After getting all three results just compare all of these results. If you find that Mean > Median > Mode data is noy symmetrical and positive skewness is present in data and we assume that our data is not normal. If Mean is approximately equal to Median and just ignore the mode then we consider our data is normal.