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The mean of following distribution is 21×1/7.Find value of f.class interval. frequency 0-10 810-20 2220-30 3130-40 f40-50 2Direct method formula :mean=Efx\nShort cut method:mean=A + Efd/EfStep deviation :mean =A+Eft/Ef ×iE is referred as sigma. ​

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ANSWER:

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