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The mean of marks secured by 55 students in division A of class X is 58, 45 students of division B is 54 and that of 75 students of division C is 52. Find themean of marks of the students of three divisions of Class X.

The mean of marks secured by 55 students in division A of class X is 58, 45 students of division B is 54 and that of 75 students of division C is 52. Find themean of marks of the students of three divisions of Class X. Correct Answer 54.4

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The mean of marks secured by 30 students in division-A of class X is 67, 55 students of division-B is 63 and that of 40 students of division-C is 61. What isthe mean of marks of the students of three divisions of Class X?
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The mean of marks secured by 50 students in division A of class X is 61, 25 students of division B is 57 and that of 50 students of division C is 55. Whatwill be the mean of marks of the students of three divisions of Class X?
The mean of marks secured by 35 students in division A of class X is 65, 45 students of division B is 61 and that of 70 students of division C is 59. What isthe mean of marks of the students of three divisions of Class X?
The mean of marks secured by 45 students in division A of class X is 69, 65 students of division B is 65 and that of 50 students of division C is 63. Findthe mean of marks of the students of three divisions of Class X.