Average expenditure of a person for the first 3 days of a week is Rs. 340 and for the next 4 days is Rs. 420. Average expenditure of the man for the whole week is:
Choose the correct answer.
A) 350 B) 370 C) 380 D) 430 E) None
Explanation:   Assumed mean = Rs. 340   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. 340 + Rs. 40 = Rs. 380   380orrect Option: 380
<result>C</result>
Average expenditure of a person for the first 3 days of a week is Rs. 340 and for the next 4 days is Rs. 420. Average expenditure of the man for the whole week is: