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9th Class Mathematics Statistics Question Bank Statistics

  • question_answer
    DIRECTIONS: Passage ? 1 Read the passages given below and answer the questions that follow. A group of students was given a math?s test. The test was completed by various students in the following time (in minutes): 18, 20, 21, 25 If the student who took 25 minutes had taken only 18 minutes to complete the test then what would have been the mean time?

    A)  18 minutes                 

    B)  20 minutes

    C)  17 minutes                 

    D)  19.25 minutes

    Correct Answer: D

    Solution :

         Replacing 25 by 18, New mean time\[=\frac{18+20+21+18}{4}=\frac{77}{4}\] \[=19.25\]minutes


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