going into the final exam, which will count as two tests, Amelia has test scores of 75, 80, 72, 63, and 94. what score does Amelia need on the final in order to have an average score of 80

Answer 1

75+80+72+63+94+2x = 7(80) = 560

2x = 560 -155-135-94=560-384=176

x=176/2= 88 needed on the final to get an 80 final grade

Unless 79.5 average will be rounded up to 80, then

2x = 7(79.5)-384 = 556.5-384=172.5

x=86.25

86 1/4 or 87 then would be sufficient to get an 80 final grade