Mean of first 8 observations is 18 and the mean of last 8 observations is 20. If the mean of 15 observations is 19. find 8th observations
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The total of the first 8 observations is 8(18) = 144
The total of the last 8 obsrvations is 8(20) = 160
the total of all 15 is 15(19) = 285
160 + 144 = 304
but this counts the 8th observation twice, which is 304 - 285 = 19
the 8th observation is 19
The total of the last 8 obsrvations is 8(20) = 160
the total of all 15 is 15(19) = 285
160 + 144 = 304
but this counts the 8th observation twice, which is 304 - 285 = 19
the 8th observation is 19
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Answer:
The total of the first 8 observations is 8(18) = 144
The total of the last 8 obsrvations is 8(20) = 160
the total of all 15 is 15(19) = 285
160 + 144 = 304
but this counts the 8th observation twice, which is 304 - 285 = 19
the 8th observation is 19.
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