DearKarishmaB
By your approach (weighed average) the answer would be 37.5, which is much closer to answer choice 38, which is a wrong answer choice, how we can avoid such mistake? or can you tell when we can find this approach is better or the approach provided byBunuel ? Because t first I used weght average for this question and mistakenly chose 38 as answer, by looking at Bunuel's approach I saw it's totallydifferent!
'Distances traveled' (i.e. ratio of 1:5) cannot be the weights here to find the average mileage. The weights have to be 'number of gallons'.
If we change the question and make it:
A certain car averages 25 miles per gallon of gasoline when driven
...
By your approach (weighed average) the answer would be 37.5, which is much closer to answer choice 38, which is a wrong answer choice, how we can avoid such mistake? or can you tell when we can find this approach is better or the approach provided byBunuel ? Because t first I used weght average for this question and mistakenly chose 38 as answer, by looking at Bunuel's approach I saw it's totallydifferent!
KarishmaB wrote:
khushboochhabra wrote:
I got Bunuel's approach.. but was wondering if weighed average should work here that is
(1*25+5*40)/6 = 37.5 ~ 38![Image]()
Seems it doesnt work here.. But shouldn'tit??
(1*25+5*40)/6 = 37.5 ~ 38
Seems it doesnt work here.. But shouldn'tit??'Distances traveled' (i.e. ratio of 1:5) cannot be the weights here to find the average mileage. The weights have to be 'number of gallons'.
If we change the question and make it:
A certain car averages 25 miles per gallon of gasoline when driven
...
Statistics : Posted by nazii • on 11 Aug 2010, 13:17 • Replies 19 • Views 119388
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