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5 students of a class have an average height 150 cm and variance 18 cm$^2$. A new student, whose height is 156 cm, joined them. The variance (in cm$^2$) of the height of these six students is:
(1) 16 (2) 22 (3) 20 (4) 18
New variance $= 22821 - 22801 = 20$.
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