Is 84 bpm normal for a 22 year old female?

Yes. Maybe just a little fast, but normal. Several factors could be involved and questions need to be asked. Is this person active? Body type, composition, weight. This would be expected for a not very active, sedentary, moderate to heavy, stocky man. You would not find this pulse rate on a guy who excersices often and has moderate to lower body fat.

Many many factors are involved, but for the most part... YES 84 is in the normal range