请教一个PREP 2数学问题，MEAN 和 MEDIAN

wiseecho

five pieces of wood have an average (arithmetic mean) length of 124 centimeters and a median length of 140 centimeters. what is the maximum possible lengh, in centimeters, of the shortest piece of wood?

a 90

b 100

c 110

d 130

e 140

多谢了

fruittea

b?

x1, x2, 140, x3, x4

My guess, can't be sure. since avg is less than median, to make the shortest max, we want the x3=x4=140, and x1=x2. so u got

2(x1)+140*3 = 124*5

wiseecho

thanks for your explanation, answer is B. you are right.

newengland

对哦

[此贴子已经被作者于2008-3-7 17:31:27编辑过]