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i have not used deviation and still got the answer using ERTT=IRTT*alpha+(1-alpha)*NRTT.what is the use of deviation in this question?

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## we use Deviation to calculate timeout time not for RTT

 TO = 4 * Deviation + RTT.

I think you are missing this point

{\displaystyle \mathrm {RTT} =\alpha \cdot \mathrm {old\_RTT} +(1-\alpha )\cdot \mathrm {new\_round\_trip\_sample} }

RTT = 0.5(10) + 0.5(16) = 5+8 = 13 

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