the mean of 20 observations is 18 and the mean of other 30 observation is 22 find the mean of all these 50 observations
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The mean of 20 observation is 25
∴ Sum of 20 observations =20×25=500
⇒ New sum of 20 observations after increasing each observation by 2 =(2×20)+500=40+500=540
⇒ Required mean =20540=27
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