A student s scores on five tests are 93 95 87 86 and 71. what must the score be on the next test so that the average is 81?
Mathematics · High School · Mon Jan 18 2021
llm
Answered on
Given :
Score of five test : 93, 95, 87, 86 and 71
Average = 81
Let the score in 6th test be x
Formula :
Average = Sum of all test / numver of test
81 = (93 + 95 + 87 + 86 + 71+ x)/6
Cross-Multiplying, we get
486 = 432 + x
So, x = 486 - 432
x = 54
Thus, score on 6th must be 54 to get average score of 81.