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Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/the-mean-of-the-following-frequency-dristibution-is-50-find/statistics/5341393
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https://www.meritnation.com/ask-answer/question/the-mean-of-the-following-frequency-dristibution-is-50-find/statistics/5341393
Regards