Question

the mean of 30 number is 18. what will be the new mean, if each observation is increased by 2j​

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 =  540 /20​  

                                =27