Question

The grades of Edwin in 4 of his 5 subjects are 78, 88, 89, and 95. Find the grade in his 5th subject if his mean grade is 88.

Answer 1

Given : The grades of Edwin in 4 of his 5 subjects are 78, 88, 89, and 95.

his mean grade is 88.

To Find :   the grade in his 5th subject

Solution:

his mean grade is 88.

Subjects are  5

Hence total grade  = 5 x 88  = 440

grades  in 4 subject = 78, 88, 89, and 95.

Total grades in 4 subjects = 78 + 88 + 89 + 95  =   350

Grade in 5th subject = 440 - 350 = 90

the grade in his 5th subject  are 90

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