The average grade of the 30-student class is 86.9 .
In the question ,
it is given that ,
the total number of students in the class = 30 students
the average grade for the first 29 students = 87
So , sum of grades of first 29 students = 87 × 29 = 2523
the grade of the remaining student = 84
So , the sum of 30 students = 2523 + 84 = 2607
So , the average grade of all the 30 students = (Sum of grades of 30 students)/(total number of students0
= 2607/30
= 86.9
Therefore , The average grade of the 30-student class is 86.9 .
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