மூன்று எண்களின் சராசரி 21. இரண்டு எண்கள் 4 மற்றும் 12 எனில், மீதமுள்ள எண் என்ன?

  1. 20
  2. 30
  3. 47
  4. 52

Answer (Detailed Solution Below)

Option 3 : 47
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கருத்து:

\(\rm Mean\ of\ 'n'\ observations=\dfrac{Sum\ of\ observations}{n}\) .

 

கணக்கீடு:

மூன்றாவது எண் x என்று வைத்துக் கொள்வோம்.

எனவே, எண்கள் 4, 12 மற்றும் x

இங்கே n = 3

நமக்கு தெரியும், \(\rm Mean\ of\ 'n'\ observations=\dfrac{Sum\ of\ observations}{n}\)

\(\rm 21=\dfrac{4+12+\rm x}{3}\)

⇒ x + 16 = 63

⇒ x = 47 .

Latest Army Havildar SAC Updates

Last updated on Jul 1, 2025

-> The Indian Army has released the Exam Date for Indian Army Havildar SAC (Surveyor Automated Cartographer).

->The Exam will be held on 9th July 2025.

-> Interested candidates had applied online from 13th March to 25th April 2025.

-> Candidates within the age of 25 years having specific education qualifications are eligible to apply for the exam.

-> The candidates must go through the Indian Army Havildar SAC Eligibility Criteria to know about the required qualification in detail. 

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