Question 1092018
  the average of 9 numbers is 45.
 if 90 and 88 are added to the set of numbers, what will be the resulting average 
:
Now you are averaging 11 numers
A = {{{((45(9)+90+88))/11}}}
A = {{{((405+178))/11}}}
A = {{{583/11}}}
 A = 53 is the new average