Question

The mean of 12 numbers is 20 and the mean of another 8 numbers is 25 find the mean of the 20 numbers

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Answer 1

22

Explanation:

mean is calculated as

mean =
`(sum)/(count)`

Given the mean of 12 numbers is 20 , then

`(sum)/(12)` = 20 ( multiply both sides by 12 )

sum = 240

Given the mean of 8 numbers is 25 , then

`(sum)/(8)` = 25 ( multiply both sides by 8 )

sum = 200

Total sum of the 20 numbers = 240 + 200 = 440, then mean of 20 numbers is

mean =
`(440)/(20)` = 22