XAT / #XAT 2018

September 02, 2017 @ 12:48 PM

September 02, 2017 @ 12:48 PM

K. J. Somaiya Institute of Management Studies and Research, Mumbai

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Questions on Mean & Median

XAT 2014 takers on 5th January 2014 are advised to read following important questions on mean and the median: 
 
Ramesh analyzed the monthly salary figures of five vice presidents of his company. All the salary figures are in integer lakhs. The mean and the median salary figures are Rs. 5 lakhs, and the only mode is Rs. 8 lakhs. Which of the options below is the sum (in Rs. lakhs) of the highest and the lowest salaries?
 
A.9
B.10
C.11
D.12
E.None of the above
 
Answer :  Option A: Rs. 9 lakhs
 
Explanation
 
The mean salary of the five vice presidents is Rs.5 lakhs.
 
So, the sum of their salaries = 5 * 5 = 25 lakhs.
 
Let their salaries in ascending order be a, b, c, d and e.
So, a + b + c + d + e = 25.
 
The median salary is Rs.5 lakhs. So, c's salary is Rs.5 lakhs.
The only mode is Rs.8 lakhs.
 
So, Rs.8 lakhs salary is drawn by the maximum number of VPs.
 
C's salary is Rs.5 lakhs. So, d and e have to draw Rs. 8 lakhs each.
Therefore, a + b + 5 + 8 + 8 = 21 or a + b = 4 
 
Their salaries are in integer lakhs.
 
Therefore, a can draw Rs.1 lakh and b can draw Rs.3 lakhs or a and b can both draw Rs. 2 lakhs each.
 
However, there is only one mode. So, a and b cannot draw Rs.2 lakhs each.
 
So, a draws Rs.1 lakh (the least salary) and e draws Rs.8 lakhs (the highest salary).
 
So, a + e = Rs.9 lakhs
 
 
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