If the mean of 10 observation is 18 and that of another 15 observation is 16. Find the mean of all 25 observation.
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mean of 10 observation=18
sum of 10 observation=180
mean of 15 observation=16
sum of 15 observation=240
mean of 25 observation=180+240/25
=420/25
=16.8
HOPE THIS HELPS!!!
sum of 10 observation=180
mean of 15 observation=16
sum of 15 observation=240
mean of 25 observation=180+240/25
=420/25
=16.8
HOPE THIS HELPS!!!
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