Question

the mean of 30 numbers is 18. find the mean if each observation is increased by 3​

Answer 1

Answer:

......

Step-by-step explanation:

The mean of 20 observation is 25

∴ Sum of 20 observations =20×25=500

⇒ New sum of 20 observations after increasing each observation by 2 =(2×20)+500=40+500=540

⇒ Required mean =

20

540

=27