Google does not assign a specific "rank out of 10" to web pages. Instead, it uses a proprietary algorithm called PageRank to determine the relevance and importance of web pages and assigns a numerical rank, usually referred to as a "search engine ranking position (SERP)" based on hundreds of factors. The PageRank algorithm takes into account factors such as the relevance of the page's content to the search query, the quality and quantity of links pointing to the page, the relevance of those linking pages, and many other signals to determine the overall ranking of a page.
It's important to note that Google's PageRank algorithm has evolved over the years, and while it used to be a major factor in determining rankings, it is now just one of many factors that Google considers. Google regularly updates its algorithms to improve search results and combat spam, so the exact details of how PageRank is calculated and used may not be publicly disclosed.