Quiz Discussion

The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is-

Course Name: SQL -Structured Query Language

  • 1] 45
  • 2] 50
  • 3] 51.4 approx
  • 4] 54.6 approx
Solution
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# Quiz
1
Discuss

The average of 50 numbers is 30. If two numbers, 35 and 40 are discarded, then the average of the remaining numbers is nearly:

  • 1] 28.32
  • 2] 29.68
  • 3] 28.78
  • 4] 29.27
Solution
2
Discuss

The average of five numbers is 7. If three new numbers would be added, then the new average comes out to be 8.5. What is the average of those three new numbers ?

  • 1] 9
  • 2] 10.5
  • 3] 11
  • 4] 11.5
Solution
3
Discuss

Find the average of 1.11, 0.01, 0.101, 0.001, 0.11 = ?

  • 1] 0.2664
  • 2] 0.2554
  • 3] 0.1264
  • 4] 0.1165
Solution
4
Discuss

19 people went to a hotel for combine dinner party 13 of them spent Rs. 79 each on their dinner and rest spent 4 more than the average expenditure of all the 19. What was the total money spent by them.

  • 1] 1628.4
  • 2] 1534
  • 3] 1492
  • 4] 1496
  • 5] None of these
Solution
5
Discuss

In Arun's opinion, his weight is greater than 65 kg but less than 72 kg. His brother does not agree with Arun and he thinks that Arun's weight is greater than 60 kg but less than 70 kg. His mother's view is that his weight cannot be greater than 68 kg. If all are them are correct in their estimation, what is the average of different probable weights of Arun?

  • 1] 67 kg.
  • 2] 68 kg.
  • 3] 69 kg.
  • 4] Data inadequate
Solution
6
Discuss

The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class, thereby decreasing the average by 4 years. The original strength of the class was-

  • 1] 10
  • 2] 11
  • 3] 12
  • 4] 15
Solution
7
Discuss

The mean of 100 items was 46. Later on it was discovered that an item 16 was misread as 61 and another item 43 was misread as 34. It was also found that the number of item was 90 and not 100. Then what is the correct mean ?

  • 1] 50
  • 2] 50.7
  • 3] 52
  • 4] 52.7
Solution
8
Discuss

The average income of A, B and C is Rs. 12,000 per month and average income of B, C and D is Rs. 15,000 per month. If the average salary of D be twice that of A, then the average salary of B and C is in Rs. :

  • 1] 8,000
  • 2] 18,000
  • 3] 13,500
  • 4] 9,000
Solution
9
Discuss

The average age of 20 boys in a class is 12 years. 5 new boys are admitted to the class whose average age is 7 years. The average age of all the boys in the class becomes:

  • 1] 8.2 years
  • 2] 9.5 years
  • 3] 12.5 years
  • 4] 11 years
Solution
10
Discuss

The average age of the mother and her six children is 12 years which is reduced by 5 years if the age of the mother is excluded. How old is the mother ?

  • 1] 40 years
  • 2] 42 years
  • 3] 48 years
  • 4] 50 years
Solution
# Quiz