Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
This book is all about financial savings.. I bought it in Hindi so that those who're finding it hard to earn get some sort of Motivation but it's all about investing and savings... Nothing about earning! Such a hype!