In an office having 160 staff members, 40% are females and the remaining are males. The average weight of females is 58 kg and that of males is 63 kg. Find the average weight of all staff members.
A.68 kg
B.61 kg✓ Correct
C.79 kg
D.58 kg
Explanation
Female staff = 64, male staff = 96. Average weight = (96×63 + 64×58)/160 = (6048+3712)/160 = 9760/160 = 61 kg.
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