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Q.

The mean marks obtained by 300 students
in Mathematics are 45. The mean of top 100 Students was
70 and the mean of last 100 was known to be 20. The mean
of remaining 100 students is

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a

50

b

40

c

43

d

45

answer is C.

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Detailed Solution

detailed_solution_thumbnail

45=70×100+x¯2×100+100×20300

⇒ 135=90+x¯2⇒x2=45.

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