Too many for someone called Tammy. She should be at home, cooking or ironing.
before taking her test, Tammy's mean was 88%. if she scores 68% on the final test, her mean will be 86%. however, if she scores 98% on the final test, her mean will 89%. how many tests has Tammy taken in total?
Hopefully when she's taken her test she'll be less mean, no one likes a meanie.