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.
FmUsing the set for last one month., star 3 because battery back up is poor. Unable to uninstall programmes installed by user. Wifi connectivity and mobile signal reception very poor comparing to other set. Camera good. Can be more user friendly.