Q12 of 69 Page 6

If the mean of the following data is 18, find the missing frequency p:


Now,



⇒18 (23 + p) = 400 + 20p


⇒414 + 18p = 400 + 20p


⇒ 18p – 20p = 400 – 414


⇒ -2p = -14


⇒ p = 7


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