The mean of 100 items was found to be 30. If at the time of calculation, two items were wrongly taken as 32 and 12 instead of 23 and 11, the correct mean is:

The mean of 100 items was found to be 30. If at the time of calculation, two items were wrongly taken as 32 and 12 instead of 23 and 11, the correct mean is:
1). 29.4
2). 29.5
3). 29.8
4). 29.9

---

Join Telegram Group

Other Questions

1. Four years ago, the average age of a family of 6 members was 27 years. A baby having been born the average age of the family is the same today. The present age of the baby (in years) is

2. The average of 11 results is 50. The average of the first 6 results is 49 and that of- the last 6 results is 52. What is the 6th result?

3. In a group of 5 persons, 4 person spent Rs 500 each for their shopping and remaining one spent Rs 100 more than the average expenditure of all the 5 persons. Find total expenditure for their shopping.

4. In a hotel, the rooms are numbered from 101 to 130 on the first floor, 221 to 260 on the second floor and 306 to 345 on the third floor. In the month of June this year, the room occupancy was 60% on the first floor, 40% on the second floor and 75% on the third floor. If it is also known that the room charges are Rs. 200, Rs. 100 and Rs. 150 on each of the floors, then find the average income per room (in Rs.) for the month of June.

5. Out of seven given numbers,the average of the first four numbers is 4 and that of the last four numbers is also 4.If the average of all the seven numbers is 3.fourth number is

6. The average of nine numbers is 50.The average of the first five numbers is 54 and that of the last three numbers is 52.Then the sixth number is

7. Out of 10 teachers of a school, one teacher retires and in his place, a new teacher of age 25 years joins. As a result, average age of teachers reduces by 3years. The age of the retired teacher is

8. A person purchased 10 shirts costing Rs. 150 per shirt. Next day he again purchased the shirts costing Rs. 150 per shirt at a discount of Rs. 30 per shirt and that day he spent a total of Rs. 1800. What is the average cost per shirt (in Rs.)?

9. The average revenues of 9 consecutive years of a company is Rs 68 lakhs. If the average of first 5 years is Rs 63 lakhs and that of last 5 years is Rs 75 lakhs, find the revenue for the 5 th year.

10. Of the four numbers whose average is 91, the first is 3/10 times the sum of other three. The first number is: