5 students of a class have an average height \( 150 \mathrm{~cm} \)...

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5 students of a class have an average height \( 150 \mathrm{~cm} \) and variance \( 18 \mathrm{~cm}^{2} \). A new student, whose height is \( 156 \mathrm{~cm} \). joined them. The variance (in \( \mathrm{cm}^{2} \) ) of the height of these six students is:
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