Question

The mean of following distribution is 21×1/7.Find value of f.
class interval. frequency
0-10 8
10-20 22
20-30 31
30-40 f
40-50 2


Direct method formula :
mean=Efx\n

Short cut method:
mean=A + Efd/Ef

Step deviation :
mean =A+Eft/Ef ×i


E is referred as sigma.
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Answer 1

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Step-by-step explanation:

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