If the mean of the following data is 20.2, find the value of p: -Maths 9th

If the mean of the following data is 20.2, find the value of p: -Maths 9th
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x̅ =  ∑fx/∑f ∴  20.2 = 610 + 20p/30 + p ⇒ 20.2(30 + p) = 610 + 20p ⇒ 606 + 20.2p = 610 + 20p ⇒ 20.2p - 20p =  610 - 606 ⇒ 0.2p = 4 ⇒ p = 4/0.2 = 40/2     ⇒ p = 20
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