Professor Jackson Gives Only a Mid-Term Exam and a Final

Multiple Choice

Professor Jackson gives only a mid-term exam and a final exam. The semester average is computed by taking of the mid-term exam score plus of the final exam score. To get a C, Birgit must have a semester average between 70 and 79 inclusive. If Birgit scored 70 on the mid-term exam, what range of scores on the final exam would give her a C ?

A) f is the final exam score ; 68  f  90.5
B) f is the final exam score ; 73  f  92.5
C) f is the final exam score ; 70  f  92.5
D) f is the final exam score ; 72.5  f  90.5