The average height of 30 girls out of a class of 40 is \( 160 cm \) and that of the remaining girls is \( 156 cm \). The average height of girls of the whole class is
98. The average height of 30 girls out of a class of 40 is \( 160 cm \) and that of the remaining girls is \( 156 cm \). The average height of girls of the whole class is
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30×160=4800
10×156=1560
4800+1560=6360
6360÷40=159
average age of 40 students is 159cm
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