the mean of 30 numbers is 18. find the mean if each observation is increased by 3
Answers
Answered by
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
Similar questions