Question

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Answer 1

Answer:

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Step-by-step explanation:

now to find mean by direct method we need class intervals ie classes,their frequency,class mark xi of given classes and finally product of frequencies and class marks ie fixi

so then mean is calculated by fixi/fi

mean can be calculated by other methods like assumed mean method and step deviation method

wherein for assumed mean method assumed mean is taken as class's mark of middle class and then di=xi-A where d means deviation

and finally we calculate product of deviation and respective frequencies

and then d mean is calculated by fidi/fi

and finally mean is calculated by A+d