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In a class test in mathematics, 10 students scored 75 marks, 12 students scored 60 marks, 8 students scored 40 marks and 3 students scored 30 marks.

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In a class test in mathematics, 10 students scored 75 marks, 12 students scored 60 marks, 8 students scored 40 marks and 3 students scored 30 marks. Find the mean of their score.

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Total number of students = 10 + 12 + 8 + 3 = 33 

Total score of 33 students = 10 x 75 + 12 x 60 + 8 x 40 + 3 x 30 

= 750 + 720 + 320 + 90 = 1880

Mean of their score 

= 56.96 or 57 approximately

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