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Complete the following activity to find ...

Complete the following activity to find the mean of the data.
`{:("Class","Class mark","Frequency",),(," "(x_(i))," "(f_(i)),x_(i) xx f_(i)),(0-20," "10," "6," "60),(20-40," "......," "......," "120),(40-60," "50," "5," "250),(60-80," "70," "7," "490),(80-100," "90," "......," "......),("Total",,sum f_(i) = 25,sum x_(i) f_(i) = 1190):}`

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