Janine received test scores of 88%, 92%, 79%, 94%, and 86%. What is the minimum score she must receive on her final exam if the five test scores are weighted equally, the final exam score is weighted twice as much as each test score, and if she wishes to have an overall average of 91%?
a) 91% b) 95% c) 89% d) 99%
e) It is impossible for her to score high enough on the final exam to have an
overall average of 91%.