Question

If the mean of 10 observation is 20 and that of another 15 observation is 16 . Find the mean of all the 25 observation.

Answer 1

Hey mate here we go

$1st \: mean \: of \: 10 \: obsrvt \: is \: 20 \\ 2nd \: 15 \: obsrt \: is \: 16 \\ \: total \: of \: 1st \: mean \: is \: 10 \times 20 = 200 \\ \: total \: of \: 2nd \: mean \: is \: 15 \times 16 = 240 \\ now \: total \: mean \: of \: 25 \: obsrvt \: is \\ \frac{240 + 200}{25} \\ mean = \frac{440}{25} \\ mean= 17.6 \\ \\ i \: hope \: this \: will \: help \: u \\ plz \: mark \: my \: ans \: as \: brainliest$