2. Questions Bank
  3. JEE Main & Advanced
  4. Mathematics
  5. Statistics

JEE Main & Advanced Mathematics Statistics Question Bank Mean

  • question_answer
    In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class are 72, then what are the average marks of the girls                                               [AIEEE 2002]

    A)                 73           

    B)                 65           

    C)                 68           

    D)                 74

    Correct Answer: B

    Solution :

               Let the average marks of the girls students be x, then \[72=\frac{70\times 75+30\times x}{100}\] (Number of girls =100?70 = 30)                                 i.e., \[\frac{7200-5250}{30}=x\]; \ x  = 65.


You need to login to perform this action.
You will be redirected in 3 sec spinner