LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
22 views
in Statistics by (24.2k points)
closed by
The average of three numbers be 21. If two of the numbers are 4 and 12, what is the remaining number?
1. 20
2. 30
3. 47
4. 52

1 Answer

0 votes
by (24.2k points)
selected by
 
Best answer
Correct Answer - Option 3 : 47

Concept:

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

 

Calculation:

Let's say that the third number is x.

So, Numbers are 4, 12 and x

Here n = 3

As we know, \(\rm Mean\ of\ 'n'\ observations=\dfrac{Sum\ of\ observations}{n}\)

∴ \(\rm 21=\dfrac{4+12+\rm x}{3}\)

⇒ x + 16 = 63

⇒ x = 47.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...