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Below is the Given Frequency Distribution of Words in an Essay:Find the Mean Number of Words Written. - Algebra

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Below is the given frequency distribution of words in an essay:

Number of words   Number of Candidates
600  -  800             12
800  -  1000             14
1000 - 1200              40
1200 - 1400              15
1400 - 1600              19

Find the mean number of words written.

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Solution

No. of words Class Mark No. of candidate        fx
          x             f          fx
600 - 800         700            12         8400
800 - 1000         900            14         12600
1000 - 1200        1100             40         44000
1200 - 1400        1300             15          19500
1400 - 1600        1500             19          28500
    ∑f =100 ∑fx = 113000

Mean by Direct method
Mean `(bar("x")) = (∑"f""x")/(∑"f") =113000/100`
                 =   1130  words     

  Is there an error in this question or solution?
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