Mean marks of 60 students of a class are 63 and that of 40 other students are 60 . the means marks of all together are ?
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Mean of marks of 60 students of a class = 63
Mean of marks of 40 other students of the class = 60
Total number of students = 100
Mean = Sum of all marks / Number of students
63 = Sum of all marks / 60
Sum of all marks = 3780
for 40 students,
Mean = Sum of all marks / Number of students
60 = Sum of all marks / 40
Sum of all marks = 2400
Mean of 100 students = 2400 + 3780 / 100 = 61.8
Mean of marks of 40 other students of the class = 60
Total number of students = 100
Mean = Sum of all marks / Number of students
63 = Sum of all marks / 60
Sum of all marks = 3780
for 40 students,
Mean = Sum of all marks / Number of students
60 = Sum of all marks / 40
Sum of all marks = 2400
Mean of 100 students = 2400 + 3780 / 100 = 61.8
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Solution :-
Mean marks of 60 students = 63
Total marks of 60 students = 63*60
Total marks of 60 students = 3780
Mean marks of 40 other students = 60
Total marks of these 40 students = 60*40
Total marks of these 40 students = 2400
Total students = 60 + 40
= 100 students
Total marks of 100 students = 3780 + 2400
= 6180 marks
Mean marks of all the 100 students = 6180/100
= 61.8 marks
Answer.
Mean marks of 60 students = 63
Total marks of 60 students = 63*60
Total marks of 60 students = 3780
Mean marks of 40 other students = 60
Total marks of these 40 students = 60*40
Total marks of these 40 students = 2400
Total students = 60 + 40
= 100 students
Total marks of 100 students = 3780 + 2400
= 6180 marks
Mean marks of all the 100 students = 6180/100
= 61.8 marks
Answer.
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