if the mean of 70 items is 60 and another 30 items is 40 then the combined mean is
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Answer:
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Answer:
Hey mate here we go
\begin{gathered}the \: 1st \: means \: of \: 20 \: items \: is \: 40 \: means \: \\ its \: total \: is \: 40 \times 20 = 800 \\ \: now \: 2nd \: mean \: \\ i.e \: 30 \times 60 = 1800 \\ \: now \: they \: asked \: for \: whole \: items \: \\ therefore \: total \: items \: are \: 20 + 30 = 50 \\ \: total \: of \: 800 + 1800 = 2600 \\ \: nw \: whole \: means \: is \\ mean = \frac{2600}{50} = 52 \\ there \: we \: got \: whole \: means \: is \: 52 \\ i \: hope \: this \: will \: help \: u \\ mark \: my \: ans \: as \: \end{gathered}
40×20=800
i.e30×60=1800
20+30=50
totalof800+1800=2600
mean=
50
2600
=52
Explanation:
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