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[" The mean marks got by "300" students in the subject of statistics was "45" .The mean of the "],[" top "100" of them was found to be "70" and the mean of the last "100" was known to be "20" ,"],[" then the mean of the remaining "100" students is "],[[" 1) "45," 2) "58," 3) "68," 4) "88]]

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