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[" 5students of a class have an average height "150cm" and "],[" variance "18cm^(2)" .A new student,whose height is "156cm" ,"],[" joined them.The variance (in "cm^(2)" ) of the height of these "],[" six students is: "],[[" (1) "16," (2) "22],[" (3) "20," (4) "18]]

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