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Mean is equal to the summation of frequency times class marks over n

or mean= summation fx

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Summation fx
Sorry i was'nt done yet
summation of fx divided by n... So you have to add the fx or class marks and divided by n... How do you get the n? easy, you to add all the tallies in the grouped data... HOPE IT HELPS A LOT
Grouped data  is a statistical term used in data analysis ^^ hope it helps...
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