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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-31

  • question_answer
    A student was asked to find the arithmetic mean of the following 12 numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the mean to be 12. The value of x will be

    A)  3                    

    B)  7  

    C)  17                   

    D)  31

    Correct Answer: B

    Solution :

    Mean, \[\frac{3+11+9+7+15+13+8+19+17+21+14+x}{12}\] According to the question,\[\frac{137+x}{12}=12\] \[\therefore \]\[137+x=144\therefore x=144-137=7\]


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