Question
Download Solution PDFThe average of the marks of 25 students in a class, in an examination was calculated to be 19. Later, the teacher realized that the marks of two students were taken as 18 and 19 respectively, instead of 14 and 15. Find the new actual average marks of the class.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
The average of the marks of 25 students in a class, in an examination was calculated to be 19.
Wrong marks are 18 and 19
Correct marks are 14 and 15
Concept used:
Average = Sum of elements/Number of elements
Calculation:
Total marks of 25 students with wrong numbers = 25 × 19
⇒ 475
Correct total = 475 - (18 + 19) + 14 + 15
⇒ 475 - 37 + 29
⇒ 467
So, new average = 467/25
⇒ 18.68
∴ The new actual average mark of the class is 18.68.
Last updated on Jul 5, 2025
-> As per the official notification, today, 4th July 2025 is the SSC CGL Last Date to apply online. So in case any candidate is left to register should submit their application form within the SSC CGL Last Date and Time ends.
-> The SSC CGL Notification 2025 has been released on 9th June 2025 on the official website at ssc.gov.in.
-> Bihar Home Guard Result 2025 has been out officially.
-> This year, the Staff Selection Commission (SSC) has announced approximately 14,582 vacancies for various Group B and C posts across government departments.
-> TNPSC Group 4 Hall Ticket 2025 has been released on the official website @tnpscexams.in
-> HSSC Group D Result 2025 has been released on 2nd July 2025.
-> The SSC CGL Tier 1 exam is scheduled to take place from 13th to 30th August 2025.
-> Aspirants should visit ssc.gov.in 2025 regularly for updates and ensure timely submission of the CGL exam form.
-> Candidates can refer to the CGL syllabus for a better understanding of the exam structure and pattern.
-> The CGL Eligibility is a bachelor’s degree in any discipline.
-> Candidates selected through the SSC CGL exam will receive an attractive salary. Learn more about the SSC CGL Salary Structure.
-> Attempt SSC CGL Free English Mock Test and SSC CGL Current Affairs Mock Test.
-> Candidates should also use the SSC CGL previous year papers for a good revision.
->The DSSSB PGT Notification 2025 is out at its official website today.
-> The DSSSB PGT Admit Card 2025 is been released for the 2024 cycle exam.