7th Class Mathematics Data Handling Question Bank Data Handling & Graphs

  • question_answer The mean of 10 observations is\[5.5\]. When one new observation is included in the data set, the mean of the observations becomes\[6.0\]. What is the value of new observation that was added to the data set?

    A)  11                  

    B)  10            

    C)  12                  

    D)  13

    Correct Answer: A

    Solution :

    (a): Sum of 10 observations \[=10\times 5.5=55\]with one more observation, sum of 11 observations \[=11\times 6=66\] \[\therefore \]  11th observation (new observation) \[=66-55=11\]           

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