Or, in layman's terms, "If we rounded up the entire population and forced every single person to carefully review this item and issue a rating, what's our best

Or, in layman's terms, "If we rounded up the entire population and forced every single person to carefully review this item and issue a rating, what's our best guess as to the percentage of people who would rate it positively?" And to make the description slightly more accurate, at the expense of more complexity: "What number are we 80% certain the approving percentage will exceed?"