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ISRO 2012 - [Mech]

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In a class of 45 students, the mean mark of 25 girls is 32 and the mean mark of 20 boys is 27.5. What is the class mean?

(a) 32
(b) 27.5
(c) 29.75
(d) 30
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25*32 + 20*27.5/45 = 30
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