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Question
The mean weight of 5 students is 47 kg. If four of them weigh 44 kg, 45 kg, 47 kg and 49 kg. Find the weight of the fifth student.
Sum
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Solution
The mean weight of 5 students is 47 kg.
Total weight of all students = mean × number of students
= 47 × 5
= 235 kg
Total weight of the first 4 students are:
44 + 45 + 47 + 49 = 185 kg
Weight of the fifth student = Total weight of all students − Total weight of the first 4 students
= 235 − 185
= 50 kg
∴ The weight of the fifth student is 50 kg.
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