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Question
The mean monthly income of 8 men is Rs. 8079.75. A man whose monthly income is Rs. 8280 has also been taken into consideration. Calculate the mean monthly income of all the men.
Solution
Since mean monthly income of 8 men = Rs.8079.75
⇒ Sum of income of 8 men
= 8 x 8079.75
= Rs.64638
By considering one income of Rs.8280,
Total number of men = 9
Sum of income of 9 men of all men
= Rs. (64638 + 8280)
= Rs.72918
∴ Mean monthly income of all men
= `(72918)/(8)`
= Rs.8102.
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