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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-24

  • question_answer
    The mean of marks secured by 55 students in division A of class X is 58, 45 students of division B is 54 and that of 75 students of division C is 52. Find the mean of marks of the students of three divisions of class X.

    A)  53.7                

    B)  54.4

    C)  53       

    D)  55.8

    Correct Answer: B

    Solution :

    \[\therefore \]Required mean of the marks \[=\frac{55\times 58+45\times 54+75\times 52}{55+45+75}\] \[=\frac{3190+2430+3900}{55+45+75}=\frac{9520}{175}=54.4\]


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