Question

· The mean of 20 observations is 55. If 4 is
added in 10 observations and 2 is subtracted
from remaining 10 observations, what will be
the new mean?​

Answer 1

Answer:

Step-by-step explanation:

Given Mean of 10 observations is 20

⟹Sum of 10 observations is S=20×10=200

If each observation is added by 5 Then sum of observations is added by 5×10=50

⟹S  

′

=200+50=250

Mean of new observation is  

10

S  

′

 

​  

=  

10

250

​  

=25