Question

The mean salary paid per week to $1000$ employees of an establishment was found to be Rs. $900$. Later on, it was discovered that the salaries of two employees were wrongly recorded as Rs. $750$ and Rs. $365$ instead of Rs. $570$ and Rs. $635$. Find the corrected mean salary.

• A. $900.90$
• B. $1,115$
• C. $1,225$
• D. $900.09$

Answer 1

The correct option is D $900.09$

We first find the corrected sum of observation.
Corrected sum of observations$=$(Sum of total incorrect observation)$-$(Sum of incorrect data)$+$(Sum of correct data).
$=900\times 1,000-(750+365)+(570+635)=9,00,090$
$\therefore$ Corrected Mean $=Rs.\frac{9,00,090}{1,000}=Rs.900.09$