Please help
David has scored 86, 70, 79, 90, and 85 on his previous five tests. What score does he need on his next test so that his average (mean) is 84
(86 + 70 + 79 + 90 + 85 + x)/6 = 84 Multiply 6 to both sides and then add everything together and then subtract i from the multiplied 86 which will get you 94. Answer: 94
