Question

The average of 8 observation is 24. If one more observation of 33 is added then the average is?

Answer 1

average = 25

Explanation:

average is calculated as

average =
`(sum)/(count)`

given the average for a count of 8 is 24 , then calculate the sum

`(sum)/(8)` = 24 ( multiply both sides by 8 to clear the fraction )

sum = 8 × 24 = 192

now add the new observation to the sum , with a count of 9

sum = 192 + 33= 225 , then

average =
`(225)/(9)` = 25