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?

Nerdo Mar 9, 2020

#4**+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

CPhill Mar 10, 2020