Question 97655
n a college Algebra class, the final exam is 20% of the course grade. If Greg's regular exam scores are 80,64,88,92 and 85. What does he need on the final exam to make a B(80%) in the course
:
Find the average of the 5 previous grades;
{{{(80 + 64 + 88 + 92 + 85)/5}}} = 81.8
:
Previous average is 4/5 and the final is 1/5 of the course grade
:
{{{(4(81.8) + x)/5}}} = 80
:
{{{(327.2 + x)/5}}} = 80
:
327.2 + x = 5(80)
:
327.2 + x = 400
:
x = 400 - 327.2
:
x = 72.8 % will maintain an 80% average