Question

In an arboretum, the heights of five trees were 21 feet, 31 feet, 36 feet, 28 feet,

and 26 feet. What would be the height of the sixth tree if the mean height of the
six trees was 28 feet?

Answer 1

26

Explanation:

(21+31+36+28+26+x)/6=28

21+31+36+28+26+x= 28×6

142+x =168

x=168-142

x=26