Average expenditure of a person for the first 3 days of a week is Rs. 320 and for the next 4 days is Rs. 420. Average expenditure of the man for the whole week is: Choose one.
A) 350 B) 370 C) 390 D) 360 E) None
Explanation:   Assumed mean = Rs. 320   Total excess than assumed mean = 4 × (Rs. 420 - Rs. 350) = Rs. 280   Therefore, Increase in average expenditure = Rs. 280/7 = Rs. 40   Therefore, Average expenditure for 7 days = Rs. 320 + Rs. 40 = Rs. 360   Correct Option: 360
<result>D</result>
Average expenditure of a person for the first 3 days of a week is Rs. 320 and for the next 4 days is Rs. 420. Average expenditure of the man for the whole week is: