Question

the mean of 35 observation is 20,out of which mean of first 18 observation is 15 and mean of last 18 observation is 25. find the 18th observation ​

Answer 1

Answer:

20

Step-by-step explanation:

20=sum/35

sum=700

sum+18th observation =720

700+18th observation =720

18th observation =720-700

18th observation =20