if the mean of 9observations is 100 and mean of 6 observations is 80 then the mean of 15 observations??
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Answered by
1
Answer:
92
Step-by-step explanation:
Sum of 9 observations = 900
Sum of 6 observations = 480
Sum of 15 observations = 900+480=1380
Mean of 15 observations = 1380/15 = 92
Answered by
3
Step-by-step explanation:
total of 9 observations=9×100
=900
total of 6 observations=6×80
=480
So total for 15 observations=900+480
=1380
So mean=1380/15
=92
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