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.
I know, its my fault that I didn't read the description well but for over $6 you automatically expect a full size can of dry shampoo. I love this product but I should have just ordered it from Wal Mart, they have the full size can of 6.5 oz for $4.77. Next time I will make sure the size fits the price.