if a mean of 10 observation be 20 and mean of 15 other observation be 16 then find the mean of all 25 observation
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Answer:
mean of 10 observations=20
sum of 10 observations=10×20=200
mean of 15 observations=16
sum of 15 observations=15×16=240
total sum=200+240=440
mean of 25 observations=440/25=17.6
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