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Average age of the people of a counry is...

Average age of the people of a counry is shown in the following table:
`{:("Age (Years)",10-20,20-30,30-40,40-50,50-60),("People ('000)"," "30," "32," "15," "12," "9):}`
Find out mean age by Direct Method.

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The correct Answer is:
Mean Age = 28.7 years
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