The mean25 observation is 26 out of this observation if the mean of first 13 observation is 22 and that of the last 13 observation is 30 the 13th observation is
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first 12 +13th observation = 13*22 = 286
last 13 observations = 13*30 =390
sum of 25 observations = 26*25 = 650
13th observation= (286+390)-650
=676-650
=26
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