500 * .8 = 400
77 + 90 + 66 + 82 = 315
400 - 315 = 85 needed on next test
Desiree's test score are 77,90,66 and 82.what score does she need on the last test in order to average 80 on her tests ?
3 answers
mean = ∑x/n
80 = (77+90+66+82+x)/5
Solve for x.
80 = (77+90+66+82+x)/5
Solve for x.
Lakita's test scores are 77, 86, 66, and 80. What score does she need on the last test in order to average 80 on her tests?
3 answers