Question

a student earned on tests the scores of 88, 75, 89, and 81. what is the lowest score the student must get on the next test to keep an average of 80?

Answer 1

can you help on this @jim_thompson5910

Answer 2

(88+75+89+81+x)/5 = 88

solve for x

Answer 3

is that suppose to be divided by 5 ? @jim_thompson5910

Answer 4

yes, you add up all 5 scores, then you divide by 5 to average them

Answer 5

sorry, the equation should be

(88+75+89+81+x)/5 = 80

Answer 6

misread but I fixed it

Answer 7

so i got 333.. so then i divide by 5 and i got 66.6 @jim_thompson5910

Answer 8

sorry I changed the equation to (88+75+89+81+x)/5 = 80 (misread initially)

Answer 9

(88+75+89+81+x)/5 = 80

88+75+89+81+x = 80*5

333+x = 400

x = ???

Answer 10

67 ? @jim_thompson5910

Answer 11

yep

Answer 12

ok thanks ... @jim_thompson5910

Answer 13

np