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.
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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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