In an examination, the average of marks was found to be 50. For deducting marks

Check All Courses

Question

In an examination, the average of marks was found to be 50. For deducting marks for computational errors, the marks of 100 candidates had to be changed from 90 to 60 each and so the average of marks came down to 45. The total number of candidates, who appeared at the examination, was

Options:

A . 300

B . 600

C . 150

D . 200

Answer: Option B
Answer: (b)Let total number of candidates be x. ∴ 50x – 30 × 100 = 45x ⇒ 5x = 3000 ⇒ x = $3000/5$=600

Was this answer helpful ?

Next Question

Submit Comment/FeedBack

More Questions on This Topic :

Question 1. The average weight of 15 students in a class increases by 1.5kg when one of the students weighing 40 kg is replaced by a....is the weight (in kg) of the new student ?

Question 2. The average weight of three men A, B and C is 84 kg. D joins them and the average weight of the four becomes 80 kg. If E....and E becomes 79 kg. The weight of A is

Question 3. The average of a collection of 20 measurements was calculated to be 56 cm. But later it was found that a mistake had occ....should have been 61 cm. The correct average must be

Question 4. The average of 10 numbers is calculated as 15. It is discovered later on that while calculating the average one number, ....36, was wrongly read as 26. The correct average is

Question 5. A student finds the average of ten 2-digit numbers. While copying numbers, by mistake, he writes one number with its dig....digits of the number, in which he made mistake, is

Question 6. The average of marks in Mathematics for 5 students was found to be 50. Later, it was discovered that in the case of one ....48 were misread as 84. The correct average is :

Question 7. The average marks secured by 36 students was 52. But it was discovered that an item 64 was misread as 46. What is the co....as 46. What is the correct mean of marks ?

Question 8. The average of 9 integers is found to be 11. But after the calculation, it was detected that, by mistake, the integer 23....the due correction is made, the new average will be

Question 9. The average weight of 12 crewmen in a boat is increased by $1/3$ kg, when one of the crewmen whose weight is 55kg is rep....new man. What is the weight of that new man?

Question 10. Average weight of 25 persons is increased by 1 kg when one man weighing 60 kg is replaced by a new person. Weight of new....by a new person. Weight of new person is :

Latest Videos

Chapter 1 - GLOBAL STEEL SCENARIO & INDI Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)

Direction Sense Test Part 1 Reasoning (Hindi)

Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE

Cube & Cuboid Part 1 Reasoning (Hindi)

Data Interpretation (DI) Basic Concept Reasoning (Hindi)

Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)

Sail E0 free webinar Webinars

Real Numbers Part 7 Class 10 Maths

Real Numbers Part 1 Class 10 Maths

Polynomials Part 1 Class 10 Maths

Latest Test Papers

Chapter 3.1 : Overview of Finance & Acco Chapter 3 : Finance & Accounts SAIL E0 - GFM 2024

Chapter 2.1 : Overview Chapter 2 : Materials Management SAIL E0 - GFM 2024

Chapter 1.1 : Personnel Functions- An ov Chapter 1 : Personnel Management SAIL E0 - GFM 2024

GPOE / GPA Combined 1 Free CBT Mock Test SAIL E0 2024

CBT Mixed Test 1 GPOE/GPA SAIL E0 2024