The mean marks of 30 students in a class is 58.5. Later on it was found that 75 was wrongly recorded as 57. Find the correct them.

Related Mcqs:

1. The average marks of a class of 30 students is 40 and that of another class of 50 students is 60. Find the average marks of all the students?

   A. 50
   B. 47.5
   C. 59
   D. 52.5

2. The average marks in mathematics scored by the students of a school at the public examination were 39. If four of these students who actually scored 5, 12, 15 and 19 marks at the examination had not been sent up, the average marks for the school would have been 44. Find the number of students sent up for examination from the school?

   A. 20
   B. 25
   C. 30
   D. 32

3. A candidate who gets 30% of the marks fails by 50 marks. But another candidate who gets 45% marks gets 25 marks more than necessary for passing. Find the number of marks for passing?

   A. 150
   B. 200
   C. 250
   D. 275

4. 40% of Raees marks is equal to 20% of Rahim’s marks which percent is equal to 30% of Rehman’s marks. If Rehman’s marks is 80, then find the average marks of Raees and Rahim?

   A. 60
   B. 70
   C. 80
   D. 90
   E. None of these

5. A student who secures 20 % marks in an examination fails by 30 marks. Another student who secures 32 % marks gets 42 marks more than those required to pass. The percentage of marks required to pass is:________?

   A. 20%
   B. 25 %
   C. 28%
   D. 30%

6. A pupil’s marks were wrongly entered as 83 instead of 63. Due to the average marks for the class got increased by half. The number of pupils in the class is___________?

   A. 10
   B. 20
   C. 40
   D. 73

7. An engineering student has to secure 36% marks to pass. He gets 130 marks and fails by 14 marks. The maximum No. of marks obtained by him is_________?

   A. 300
   B. 400
   C. 350
   D. 500

8. If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is__________?

   A. 53.33
   B. 54.68
   C. 55
   D. None of these

9. The average of the marks of 12 students in a class is 36. If the marks of each student are doubled, find the new average?

   A. 72
   B. 45
   C. 37
   D. 79

10. The average height of 35 boys in a class was calculated as 180cm. It has later found that the height of one of the boys in the class was wrongly written as 166 cm whereas his actual height was 106 cm. Find the actual average height of the boys in the class (Round off your answer to two decimal places)?

    A. 179.29 cm
    B. 178.29 cm
    C. 179.38 cm
    D. 178.39 cm