Quiz Discussion

The average age of three boys is 15 years. If their ages are in ratio 3 : 5 : 7, the age of the youngest boy is

 

Course Name: SQL -Structured Query Language

  • 1] 21 years
  • 2] 18 years
  • 3] 15 years
  • 4] 9 years
  • 5] 12 years
Solution
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# Quiz
1
Discuss

The average of 6 observations is 45.5. If one new observation is added to the previous observations, then the new average becomes 47. The new observation is :

  • 1] 58
  • 2] 56
  • 3] 50
  • 4] 46
Solution
2
Discuss

There are two sections A and B of a class, consisting of 36 and 44 students' respectively. If the average weight of section A is 40kg and that of section B is 35kg, find the average weight of the whole class.

  • 1] 30 kg
  • 2] 35 kg
  • 3] 42.5 kg
  • 4] 37.25 kg
Solution
3
Discuss

The mean of 100 observations was calculated as 40. It was founder later on that one of the observation was misread as 83 instead of 53. The correct mean is :

  • 1] 39
  • 2] 39.7
  • 3] 40.3
  • 4] 42.7
Solution
4
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
5
Discuss

The average (arithmetic mean) of 330, 360 and 390 is :

  • 1]

    \({3^{27}} + {3^{57}} + {3^{87}}\)

  • 2]

    \({3^{29}} + {3^{59}} + {3^{89}}\)

  • 3]

    \({3^{60}}\)

  • 4]

    \({3^{177}}\)

Solution
6
Discuss

The average of five numbers is 306.4. The average of the first two numbers is 431 and the average of the last two numbers is 214.5. What is the third number?

  • 1] 52
  • 2] 108
  • 3] 321
  • 4] Cannot be determined
  • 5] None of these
Solution
7
Discuss

Average of 80 numbers are 42. When 5 more numbers are included, the average of 85 numbers become 45. Find the average of 5 numbers.

  • 1] 82
  • 2] 89
  • 3] 93
  • 4] 98
Solution
8
Discuss

a, b, c, d, e, f, g are consecutive even numbers. j, k, l, m, n are consecutive odd numbers. The average of all the numbers is :

  • 1]

    \(3\left( {\frac{{a + n}}{2}} \right)\)

  • 2]

    \(\left( {\frac{{1 + d}}{2}} \right)\)

  • 3]

    \(\left( {\frac{{a + b + m + n}}{4}} \right)\)

  • 4]

    \(3\left( {\frac{{j + c + n +g}}{4}} \right)\)

Solution
9
Discuss

The average of the ages of Sumit, Krishna and Rishabh is 43 and the average of the ages of Sumit, Rishabh and Rohit is 49. If Rohit is 54 years old, what is Krishna’s age?

  • 1] 24 years
  • 2] 36 years
  • 3] 45 years
  • 4] Cannot be determined
  • 5] None of these
Solution
10
Discuss

Find the average of first 97 natural numbers.

 

  • 1] 47
  • 2] 37
  • 3] 48
  • 4] 49
  • 5] 49.5
Solution
# Quiz