有一道GRE数学题不太明白,题干如下：HousePricesNumberofHouses$100,000-$133,00012$134,000-$166,00025$167,000-$199,0008Thetableshowthedistributionofpricesof45

Question

有一道GRE数学题不太明白,
题干如下：House Prices               Number of Houses$100,000-$133,000                  12$134,000-$166,000                  25$167,000-$199,000                  8 The table show the distribution of prices of 45 houses for sale in a certain region.Select two of the following choices and place them in the blanks below so that the resulting statement is true.$175,000   $185,000   $190,000at most $42,000   at least $57,000If the highest price of the 45 houses is __________,then the range of the prices of the 45 houses is __________Clink on a choice,then click ona blank.

Answer 1

第一个空 $190,000,第二空at least $57,000
你肯定是题目意思没弄懂,很简单的
有12个房子在价格区间$100,000-$133,000,25个在$134,000-$166,000,8个在$167,000-$199,000
如果45个房子中,最高价是$190,000,则房价的range（范围,最高价-最低价）是最少$57,000
因为已知最高价是190,000且有房子在$100,000-$133,000这个区间 所以就算12个房子都是$133,000,则range也为190,000-133,000=57,000 为最小值