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in Mathematics by (39.9k points)
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If mean of 5,10,15,P,20,35,40 is 21. Then the value of P will be 

(1) 18 

(2) 22 

(3) 25 

(4) 30

1 Answer

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Best answer

(2) 22

mean = \(\cfrac{5+10+15+p+20+35+40}{7}\)

⇒ 21 x 7 = 125 + p

⇒ 147 - 125 = p

⇒ p = 22

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