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Quantity I: Increased Average = 1.5, Number of people (n) = 30 Average = Total sum/n Total weight increased = 1.5 `xx` 30 = 45 kg Weight of new man = 45 + 48 = 93 kg Quantity II: Total weight of 60 students = 60 `xx` 70 New weight = (60 `xx` 70) – 72 – 64 + 64 + 52 = (60 `xx` 70) – 20 New average = (4200 – 20)/60 = 69.66 kg
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