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 is my first purchase in Amazon.Now I decided to purchase my requirements only in Amazon in future. Product is so nice.Safe packing. Timely delivered. Price also reasonable. So I like to continue with Amazon.