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

  • question_answer
    Yoga classes were held for following duration in a particular week.
    Day Duration of exercise (min)
    Sunday 40
    Monday 50
    Tuesday 60
    Wednesday x
    Thursday 30
    Friday 90
    Saturday 90
    If the average duration of yoga class in the week is 60 minutes, what was the duration of yoga class on Wednesday?

    A)  \[60\text{ }min\]   

    B)  \[30\text{ }min\]        

    C)  \[55\text{ }min\]                     

    D)  \[65\text{ }min\]

    Correct Answer: A

    Solution :

    (a): Average duration \[=\frac{40+50+60+x+30+90+90}{7}=60\] \[\Rightarrow \,150+x+210=60\times 7\Rightarrow x+360=420\] \[\Rightarrow \,x=60\]                        


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