If you notice the ranking is not consecutive with the use of the RANK function; that is because the RANK function ranks records of the result-set sequentially starting from 1. When it finds a tie it assigns the same rank to the all the records in the tie, but still keeps incrementing the record counter so the next record will get a new rank which would be (previous rank + no of records in the current tie + 1) .
not plausible; not having the appearance of truth or credibility: an implausible alibi. Origin of implausible. 1595-1605.
impervious. 1  not permitting penetration or passage; impenetrable: The coat is impervious to rain. 2  incapable of being injured or impaired: impervious to wear and tear. 3  incapable of being influenced, persuaded, or affected: impervious to reason; impervious to another's suffering.