Question

The mean of 20 items is 40 and the mean of another 30 items is 60.what is the me`an of whole set of items.

Answer 1

52

Explanation:

multiply the mean of 20 and it's items and the mean of 30 and it's item

20 × 40 = 800

30 × 60 = 1800

add the both result together

1800 + 800 = 2600

divide the final result by the means

2600/ (20 + 30)

2600/50

=52

∴ the mean of the whole set of items is 52

Hope this helps

Answer 2

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➷ 40 x 20 = 800

60 x 30 = 1800

1800 + 800 = 2600

2600/ (20 + 30) = 52

The mean of the whole set of items is 52

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