2. Sample Papers
  3. Railways

Railways Sample Paper RRB (Group D) Sample Test Paper-9

  • question_answer
    The average of 5 consecutive numbers is n. If the next two numbers are also included, the average of the 7 numbers will

    A)  Increase by 2                

    B)  Increase by 1

    C)  Remain the same

    D)  Increase by 1.4

    Correct Answer: B

    Solution :

    [b] Let the numbers be \[-2,\,\,n-1,\,\,n,\,\,n+1\]  and n+2. Their average = n. Next two consecutive numbers are \[n+3\]and\[n+4\]. Therefore the average of 7 consecutive numbers \[=\frac{(n-\,2)+(n-\,1)+n+(n+1)+(n+2)+(n+3)+(n+4)}{7}\]\[=\frac{5n+2n+7}{7}=n+1\]


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