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Ishaan Shukla asked in Math

Please answer it fast this question whole format!!!

Thank You
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Josepaul Paulachan answered this

Mean, x̅ = ∑fx / ∑f

∴  20.2 = (610 + 20p)/30 + p

⇒ 20.2(30 + p) = 610 + 20p

⇒ 60.6 + 20.2p = 610 + 20p

⇒ 20.2p - 20p =  610 - 606

⇒ 0.2p = 4

⇒ p = 4/0.2 = 40/2     ⇒ p = 20