What is the mean deviation of the data 2, 9, 9, 3, 6, 9, 4 ?

  1. 2.23
  2. 2.57
  3. 3.23
  4. 3.57

Answer (Detailed Solution Below)

Option 2 : 2.57
Free
UPSC NDA 01/2025 General Ability Full (GAT) Full Mock Test
5.8 K Users
150 Questions 600 Marks 150 Mins

Detailed Solution

Download Solution PDF

Concept:

To find the mean deviation, use the following steps

Step 1: Find the mean value for the given data values

Step 2: Now, subtract mean value form each of the data value given (Note: Ignore the minus symbol)

Step 3: Now, find the mean of those values obtained in step 2.

Mean deviation =1n|xx¯|

Calculations:

Given data is 2, 9, 9, 3, 6, 9, 4 

⇒ n = 7

Mean x¯=2+9+9+3+6+9+47

⇒  x¯=6

Mean deviation 

=1n|xx¯|

⇒ Mean deviation 

=17(|26|+|96|+|96|+|36|+|66|+|96|+|46|)

⇒ Mean deviation =  2.57

Hence, the mean deviation of the data 2, 9, 9, 3, 6, 9, 4 is 2.57

Latest NDA Updates

Last updated on Jul 8, 2025

->UPSC NDA Application Correction Window is open from 7th July to 9th July 2025.

->UPSC had extended the UPSC NDA 2 Registration Date till 20th June 2025.

-> A total of 406 vacancies have been announced for NDA 2 Exam 2025.

->The NDA exam date 2025 has been announced. The written examination will be held on 14th September 2025.

-> The selection process for the NDA exam includes a Written Exam and SSB Interview.

-> Candidates who get successful selection under UPSC NDA will get a salary range between Rs. 15,600 to Rs. 39,100. 

-> Candidates must go through the NDA previous year question paper. Attempting the NDA mock test is also essential. 

Get Free Access Now
Hot Links: teen patti master 2025 teen patti bliss teen patti master real cash