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In a frequency distribution having class...

In a frequency distribution having class intervals 0-10, 10-20, 20-30 and 30-40, the respective frequencies are x, x + 8, x - 2 and x - 4 and the arithmetic mean of the distribution is 17.8
The median lies in which one of the following class intervals ?

A

0-10

B

10-20

C

20-30

D

30-40

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