Question

At a medical clinic, the average waiting time for the first 10 patients was 15 minutes and the next 15 patients, 20 minutes. What was the average waiting time for all the patients?

Answer 1

`bart=18" "`minutes

Explanation:

average time`=("total time of first 10+total time of next 15")/("total patients")`

`bart=(15(10)+15(20))/(10+15)=18`

God bless....I hope the explanation is useful.