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What is the arithmetic mean of first 20 odd natural numbers? (SSC CGL 1st Sit. 2015)
- a)17
- b)19
- c)22
- d)20
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
What is the arithmetic mean of first 20 odd natural numbers? (SSC C...
For 20 natural last odd number = 1 + (20 – 1) × 2 = 39
Arithmetic mean of odd number = (n + 1)/2
= 40/2 =20
Arithmetic mean of odd number = (n + 1)/2
= 40/2 =20
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What is the arithmetic mean of first 20 odd natural numbers? (SSC C...
Understanding Odd Natural Numbers
The first 20 odd natural numbers are a sequence starting from 1 and increasing by 2 each time. They are:
- 1, 3, 5, 7, 9, 11, 13, 15, 17, 19,
- 21, 23, 25, 27, 29, 31, 33, 35, 37, 39
Finding the Sum of the Numbers
To calculate the arithmetic mean, we first need the sum of these numbers. The sum of the first n odd natural numbers is given by the formula:
- Sum = n^2
For n = 20 (the count of the first 20 odd natural numbers):
- Sum = 20^2 = 400
Calculating the Arithmetic Mean
The arithmetic mean (average) is calculated by dividing the sum by the number of terms:
- Mean = Sum / Number of Terms
- Mean = 400 / 20 = 20
Conclusion
Thus, the arithmetic mean of the first 20 odd natural numbers is:
- 20
The correct answer is option 'D'.
The first 20 odd natural numbers are a sequence starting from 1 and increasing by 2 each time. They are:
- 1, 3, 5, 7, 9, 11, 13, 15, 17, 19,
- 21, 23, 25, 27, 29, 31, 33, 35, 37, 39
Finding the Sum of the Numbers
To calculate the arithmetic mean, we first need the sum of these numbers. The sum of the first n odd natural numbers is given by the formula:
- Sum = n^2
For n = 20 (the count of the first 20 odd natural numbers):
- Sum = 20^2 = 400
Calculating the Arithmetic Mean
The arithmetic mean (average) is calculated by dividing the sum by the number of terms:
- Mean = Sum / Number of Terms
- Mean = 400 / 20 = 20
Conclusion
Thus, the arithmetic mean of the first 20 odd natural numbers is:
- 20
The correct answer is option 'D'.
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What is the arithmetic mean of first 20 odd natural numbers? (SSC CGL 1st Sit. 2015)a)17b)19c)22d)20Correct answer is option 'D'. Can you explain this answer? for SSC CGL 2025 is part of SSC CGL preparation. The Question and answers have been prepared according to the SSC CGL exam syllabus. Information about What is the arithmetic mean of first 20 odd natural numbers? (SSC CGL 1st Sit. 2015)a)17b)19c)22d)20Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for SSC CGL 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the arithmetic mean of first 20 odd natural numbers? (SSC CGL 1st Sit. 2015)a)17b)19c)22d)20Correct answer is option 'D'. Can you explain this answer?.
What is the arithmetic mean of first 20 odd natural numbers? (SSC CGL 1st Sit. 2015)a)17b)19c)22d)20Correct answer is option 'D'. Can you explain this answer? for SSC CGL 2025 is part of SSC CGL preparation. The Question and answers have been prepared according to the SSC CGL exam syllabus. Information about What is the arithmetic mean of first 20 odd natural numbers? (SSC CGL 1st Sit. 2015)a)17b)19c)22d)20Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for SSC CGL 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the arithmetic mean of first 20 odd natural numbers? (SSC CGL 1st Sit. 2015)a)17b)19c)22d)20Correct answer is option 'D'. Can you explain this answer?.
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