If the mean of first 10 observations is 15 and the mean of 15 observations is 10.
Find the mean of all observations.
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Answer:
TOTAL OF FIRST TEN OBSERVATIONS IS = 15×10=150
TOTAL OF FIRST FIFETEEN OBSERVATIONS IS = 10×15 = 150
MEAN OF ALL OBSEVATION
= 150+150/10+15
= 300/25
= 12 IS THE MEAN OF THE TOTAL OBSERVATIONS
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