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The five tallest buildings in Los Angeles in 1985 had a mean height of 733 feet. The tallest of the five buildings has a height of 858 feet, the shortest of the five 625 feet. If a new building were constructed with a height of 885 feet, by how many feet would it increase the mean height of the five tallest buildings of the city?

 Mar 9, 2020
 #1
avatar+111393 
+2

NVM  !!!

 

 

 

 

cool cool cool

 Mar 9, 2020
edited by CPhill  Mar 9, 2020
 #3
avatar+111393 
+2

 

 

 

cool cool cool

CPhill  Mar 9, 2020
edited by CPhill  Mar 9, 2020
 #4
avatar+111393 
+4

Call the  total  of the  unknown bldg heights = x

 

So

 

625  + x  + 858

____________  =     733

            5

 

1483  + x =  733 (5)

 

1483 + x  =3665   subtract  1483  from each side

 

x =   2182

 

When the  new  bldg is  added   the average  is

 

858  + 2182  + 885               

_________________  =   785

               5

 

So  the increase in the average is     785 - 733  =    52  ft

 

 

 

cool cool cool

 Mar 10, 2020
edited by CPhill  Mar 10, 2020

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