Question

The mean of 10 observations is 7 & the mean of 15 observations is12 then mean of all the observations

Answer 1

HEY MATE., HERE IS UR ANSWER

Answer: (10x7 + 3 x 5)/(7+3) = (70 + 15)/10 = 85/10 = 8.5

HOPE IT WILL HELP U

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Answer 2

hey mate here is your answer

and your answer is

total observation = 10+15

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=25

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So, the mean is =19

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hope it will help you

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please mark as brainlistcanswer