Question
Download Solution PDFIn a class of 60 students, the average height of 20 students is x centimeter, the average height of other 20 students is y centimeter and the average height of the remaining 20 students is z centimeter. Find the average height of the whole class.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
The class has a total of 60 students
Calculation:
The average height of 20 students is x cm, Total height = 20x
Similarly total height of next 20 students = 20y and for next 20 students = 20z
The average height of the whole class = (20x + 20y + 20z)/60 = \(\frac{20 \times (x + y + z)}{60} \) = (x + y + z)/3 cm
∴ The correct answer is option 4
Last updated on Jul 17, 2025
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