Find out mean from the frequency distribution given below:
Wages (₹) more than 0 10 20 30 40
No. of workers 65 58 35 21 7
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Calculate the mean for the following frequency distribution:
Marks 10−20 20−30 30−40 40−50 50−60 60−70 70−80
Frequency 3 7 10 6 8 2
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