the mean mass of a group of 11 men is 70 kg what is the mean mass when a man of 90 kg leaves
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Mean mass = 70 kg
Total mass= 70kg ×11
=770 kg
Mass when a man left=770 kg - 90 kg
=680 kg
Persons left=11-1 =1
New mean mass =680kg/10
=68 kg
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