28. Mohini obtained 90 marks in English, 84 in Algebra, 75 in Science and76 in Music. English-4,Science-2, If the subject has following weights. -- Alzebra-3, Music-1, then the mean marks are: a.78 b.81 c.82 d.83
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Percentage marks in the examination-
English=60
Maths=90
Physics=75
Chemistry=66
Weight allotted to each subjects are-
English=2,Maths=4,English=3 and chemistry=66
Mean=Sum of all observationsum of all observation value
∴ Weight mean=2+4+3+360×2+90×4+75×3+66×3
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