Answer :

GIVEN: total no of students = 20

5 students have scored 76 marks

7 students have scored 77 marks

8 students have scored 78 marks

FORMULA USED: Arithmetic mean =

Number of students = 20

Sum of marks = (5×76) + (7×77) + (8×78)

= 380 + 539 + 624

= 1543

Arithmetic mean =

Arithmetic mean = = 77.15

CONCLUSION: Arithmetic Mean of marks of class is 77.15

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