If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:

Answers (1)

Total marks of all batches = 55x50 + 60x55 + 45x60

                                          = 55x110 + 60x45

                                         = 6050 + 2700

                                        = 8750

Total number of students = 55 + 60 + 45 = 160

Average marks of all students = 8750/160 = 54.68 

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