math
posted by Jessica on .
An instructor counts homework as 1/3 of the student's grade and the final exam to be 2/3 of the student's final grade. Going into the final exam a student has a homework grade of 48%. What range of scores on the final exam would put the student's final average between 70% and 80% inclusive if the instructor does not round off grades?
What is the range of the final exam scores?

1/3 of 48=16 points
He wants a 80 or 70
He needs 64 to 54 more points
so he needs to get on his final exam
3/2*64 to 3/2*70 
Probability