Each of 8 girls of a class has a score 28.If new girl with a score with 56 marks more than the average of all 9 girls is added.What is the sum total of values of all the 9 girls.
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Total marks = 84
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Total marks of 28 students in Mathematics = 28 x 50 = 1400
New number of students = 28 - 8 = 20
New average of marks in Mathematics = 50 + 5 = 55
∴ Total marks of 20 students in Mathematics = 20 x 55 = 1100
∴ Total marks of 8 students who left the school = 1400 - 1100 = 300
∴ Average marks of these 8 students = 8300 = 37.5
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