Question

Find the mean of the data: 6, 8, 9, 10, 6, 7, 9, 11, 7, 6,
If mean of 10 observations be 20 and mean of 15 other observations be 16, then
find the mean of all the 25 observations.
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Answer 1

Answer:

We know mean =observationsum

For first 10 observations:

20=10sum1

sum1=sum of first 10 observations

sum1=20×10=200

For another 15 observations:

16=15sum2

sum2= sum of another 15 observations

sum2=16×15=240

Mean of all 25 observations:

mean=25sum1+sum2

mean=25200+240=25440=17.6

Step-by-step explanation:

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