To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
The cartridge did not fit exactly right into the printer. When the cartridge was installed, pressed firmly into its track, the printer was unable to see it, pull ever so slightly back on the cartridge and it functions correctly, only occasionally requiring readjustment to continue working.