The answere is no. The relation between the two on a scale of -1 to 1 is .16, which seems like a neutral relationship. My finding says that people give more value to the content of the book rather than number of pages in the book.
The answer is no. The co-relation between the two vaiable on a scale of -1 to 1 is .03. This may be because some books might have good rating but only a few people have read that book or there may be afake rating about the book. But in most cases people only write reviews after reading the book.