Question

The mean
of 20 items is 40 and the mean
of another 30 items is 6o what is the mean of
whole sed of items?​

Answer 1

Answer:

Mean = 52

Step-by-step explanation:

The formula for calculating mean is:

mean = sum of observations ÷ no. of observations

For the first set,

mean = 40, no. of observations = 20

40 = sum÷20

sum = 40×20

sum = 800

For the second set,

mean = 60, no. of observations = 30

60 = sum÷30

sum = 60×30

sum = 1800

Total sum = 800+1800 = 2600

Total no. of observations = 20+30 = 50

Total mean = 2600÷50

Total mean = 52

Answer 2

Answer:

$52$

Step-by-step explanation:

$the \: 1st \: means \: of \: 20items \: \\ is \: 40means \: \: its \: total \: is \: 40 \times 20 = 800 \\ \\ now \: 2nd \: mean \: \\ i.e \: 30 \times 60 = 800 \\ \\ now \: they \: asked \: for \: whole \: items \\ therefore \: total \: items \: are \: 20 + 30 = 50 \\ \\ total \: of \: 800 + 1800 = 2600 \\ \\ now \: whole \: means \: is \: \\ \\ mean = \frac{2600}{50} = 52 \\ \\ there \: we \: got \: whole \: means \: is \: 52. \\ \\ \\ \\ \\ \\ \\ hope \: it \: helps \: u \: dear \:$