how A is obtained in assumed mean method
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Step-by-step explanation:
In assumed mean method a is the mean which we have to assumed it is nearly the half of class mark or xi
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Step-by-step explanation:first arrange all the class, marks and frequency in columnar form.
Then obtain the column of xi I.e. Class marks by upper limit - lower limit /2
Then take the middle column in the class marks column and you get your 'a'
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