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Solution


Q.

The mean weight of 9 items is 15. If one more item is added to the series, the mean becomes 16. The value of 10th item is

Ans.

(25)

Let x1,x2,x3,…,x9 are 9 items then their mean⇒x1+x2+x3+⋯+x99=15

∴ ∑i=19xi=135  If one more item x10 is added then  ∑i=110xi=135+x10

∴ mean x¯=135+x1010=16

∴ x10=160-135=25