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 \( 150 \mathrm{~cm} \)
\( \mathrm{P} \) and variance \( 18 \mathrm{~cm}^{2} \). A new student, whose height is

W \( 156 \mathrm{~cm} \), joined them. The variance (in \( \mathrm{cm}^{2} \) ) of the height of these six students is:
(1) 16
(2) 22
(3) 20
(4) 18
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