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The average height of 42 students in a class is 4’8”. Five students of average height 4’6” moved to new section while 7 students of total height 31’10” joined the class. The average height of the students in the class is now
  • a)
    4’6”
  • b)
    5’
  • c)
    4’7”
  • d)
    4’8”
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The average height of 42 students in a class is 4’8”. Five...
Given,
Number of students = 42
Average height = 4’8”
∵ 1’ = 12’’
∴ Average height = (4 × 12) + 8 = 56’’
∴ Total height students
= Number of students × Average height
= 42 × 56 = 2352’’
Again,
Number of moved student = 5
Average height of moved students = 4’6’’ = (4 × 12) + 6 = 54’’
∴ Total height of moved students
= Number of moved students × Average height of moved students
= 5 × 54 = 270’’
Again,
Number of joined students = 7
Total height of joined students = 31’10’’ = (31 × 12) + 10 = 382’’
Now,
Number of students of the class at present = 42 – 5 + 7 = 44
Total height of these 44 students = 2352’’ – 270’’ + 382’’ = 2464’’
∴ Average height of students at present
= Total height/Number of students
= 2464’’/ 44 = 56’’
∵ 1’ = 12’’
∴ Average height of students at present = 56’’/12’’ = 4’8’’
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The average height of 42 students in a class is 4’8”. Five students of average height 4’6” moved to new section while 7 students of total height 31’10” joined the class. The average height of the students in the class is nowa)4’6”b)5’c)4’7”d)4’8”Correct answer is option 'D'. Can you explain this answer?
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The average height of 42 students in a class is 4’8”. Five students of average height 4’6” moved to new section while 7 students of total height 31’10” joined the class. The average height of the students in the class is nowa)4’6”b)5’c)4’7”d)4’8”Correct answer is option 'D'. Can you explain this answer? for Railways 2024 is part of Railways preparation. The Question and answers have been prepared according to the Railways exam syllabus. Information about The average height of 42 students in a class is 4’8”. Five students of average height 4’6” moved to new section while 7 students of total height 31’10” joined the class. The average height of the students in the class is nowa)4’6”b)5’c)4’7”d)4’8”Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Railways 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The average height of 42 students in a class is 4’8”. Five students of average height 4’6” moved to new section while 7 students of total height 31’10” joined the class. The average height of the students in the class is nowa)4’6”b)5’c)4’7”d)4’8”Correct answer is option 'D'. Can you explain this answer?.
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