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9th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    A student gets the following percentages in an examination English = 50%, Biology = 40%, Mathematics = 60%, Physics = 70%, Chemistry = 80% It was suggested that he has been given double weight age on his marks in Physics and Chemistry than in other subjects. What is the arithmetic weight age mean of marks?

    A) 57.4                            

    B) 59.4

    C) 58.4                            

    D) 64.28

    Correct Answer: D

    Solution :

    Physics and Chemistry are supposed to have double weightage. Hence they would be included as 2 subjects each Mean \[\frac{140+160+60+40+50}{7}=\frac{450}{7}=64.28\]


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