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 The mean of marks secured by 65 students in division A of class X is 54, 30 students of division B is 50 and that of 55 students of division C is 48. Find the mean of marks of the students of three divisions of Class X.

Asked by sravananantha17 20th February 2018, 11:13 PM
Answered by Expert
Answer:
begin mathsize 16px style The space mean space of space 65 space students space is space 54.
rightwards double arrow Sum space of space the space marks space of space 65 space students
equals straight n cross times mean
equals 65 cross times 54
equals 3510
Similarly
Sum space of space the space marks space of space 30 space students space is space 1500.
Sum space of space the space marks space of space 55 space students space is space 2640.
Total space number space of space students equals 65 plus 30 plus 55 equals 150
Mean space of space the space students space of space three space divisionof space class space straight X
equals fraction numerator 3510 plus 1500 plus 2640 over denominator 150 end fraction
equals 51 end style
Answered by Expert 21st February 2018, 9:40 AM
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