What is the average height of the n people in a certain group?
(1) The average height of the n/3 tallest people n the group is
6feet2又1/2inches, and the average height of the rest of the people
n the group is f feet 10 inches.
(2) The sum of the heights of the n people is 178 feet 9 inches.
Ans: A
Thx
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 122.121.21.123