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Find the Mean from the following group data. Classes Frequency 11-21 18 21-31 20 31-41 25...

Find the Mean from the following group data.
Classes Frequency
11-21 18
21-31 20
31-41 25
41-51 30
51-61 46
61-71 48
71-81 35
81-91 27
91-101 24
101-111 10

Math   Calculus   
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