Question

there are five exams. the student earned grades 84,75,97, and 89 for the first four exams.what grade must the student earn pm the last exam to get an exam avergae of at least 85?

Answer 1

81

Explanation:

Given total number of tests are 5

The grades earned by the students in the tests are 84 , 75 , 97 , 89

let the grade earned by the student in the fifth test be x.

Average=
`(84+75+97+89+x)/(5)`

The condition recquired is Average≥85

`(84+75+97+89+x)/(5)`≥85

`(344+x)/(5)`≥85

`x+344≥425`

x≥81.

The least grade the student can earn in the last test so that average is not less than 85 is 81