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Question -

If the mean of the following distribution is 27, find the value of p.



Answer -

Mean = 27

⇒ 27 (43 +p) = 1245 + 15p
⇒ 1161 + 21p = 1245 + 15p
⇒ 27p -15p= 1245 – 1161
⇒ 12p = 84
⇒ p = 84/12
Hence p = 7

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