The mean mass of 6 girls is 55 kg. When the mass of a girl is excluded, the mean mass
of the remaining 5 girls becomes 50 kg. Find the mass of the girl that has been
excluded.
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Answer:
Mean weight of 6 girls = 55 kg.
Total weight of 6 girls = (55 × 6) kg = 330 kg.
Total weight of 5 girls = (50 × 5) kg
= 250 kg.
Weight of the 6th girl = (total weight of 6 girls) - (total weight of 5 girls)
= (330 - 250) kg
= 80 kg.
Hence, the weight of the sixth girl is 80 kg.
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=330-250
=80 kg
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