Question

If the mean of 10 observations is 20 and that of other 15 observations is 16 Find the mean of all the 25 observations​

Answer 1

This is the answer for the given question. ...

Answer 2

so buddy here is the answer

let the observations be X

then

sum of all observations/10=20

X/10=20

X=200

so sum of 10 observations is 200

now similarly for 15 observations

X/15=16

X=240

so sum of all observations =240+200=440
mean will be =440/25=17.6
so answer is 17.6

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wishes-vinay