What was the size of the sample used to find the average? What is the source of the data? How was the data collected?

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Answer the following questions. If you cannot find an answer for a question, explain what effect this might have on the information in the article.
Which kind of average has been used?

What was the size of the sample used to find the average?

What is the source of the data? How was the data collected?

Do you think the average was chosen to give valid and reliable results, or to attract the most readers?