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Exercise 14.1

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Exercise 14.1

    • Posted by Mohi Soni 4 years, 10 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Gaurav Seth 4 years, 10 months ago

    In order to find the mean value, we will use direct method because the numerical value of fi and xi are small.

    Find the midpoint of the given interval using the formula.

    Midpoint (xi) = (upper limit + lower limit)/2

    No. of plants

    (Class interval)

    		 No. of houses

    Frequency (fi)

    		 Mid-point (xi) fixi
    0-2 1 1 1
    2-4 2 3 6
    4-6 1 5 5
    6-8 5 7 35
    8-10 6 9 54
    10-12 2 11 22
    12-14 3 13 39
      Sum fi = 20   Sum fixi = 162

    The formula to find the mean is:

    Mean = x̄ = ∑fi xi /∑fi 

    = 162/20

    = 8.1

    Therefore, the mean number of plants per house is 8.1

     

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    Mohi Soni 4 years, 10 months ago

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