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  1. The average height of 30 girls out of a class of 40 is 160 cms and that of the remaining girls is 156 cms. the average height of the whole class is ?
    1. 11.8
    2. 25
    3. 29.5
    4. 30
Correct Option: D

Average height of the whole class = sum of height of 40 girls / 40
= (30 x 160 + 10 x 156) / 40
= 159 cms.


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