The mean mass of 4 girls is 55kg.Amy is 58kg siti is 60kg and Fatimah is 46kg. What is the mass of the fourth girl, Aini?
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Answer:
Mass of Aini is 56kg
Step-by-step explanation:
Mean=sum of all observations /no. Of observation
= (58 + 60 + 46 + x)kg /4 = 55 kg
= 164 kg + x /4 = 55kg
= 164kg + x = 55*4kg
= 164kg +x = 220kg
= x = (220 - 164)kg
= x = 56kg
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