Question

John's grades in Algebra are: 65, 83, and 93. What grade does John need on the final exam to get an 85

average (mean)?

Answer 1

99 marks

Explanation:

Let 'x' be the mark in final exam

Sum of all the data's/ Number of data's = Mean

`(65+83+93+x)/(4)=85\\\\\\(241+x)/(4) = 85`

241 + x = 85*4

241 + x = 340

x = 340 - 241

x = 99