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Sajjad1994
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Sajjad1994
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1) The arithmetic mean of the number of stations in the European subway systems =
(Paris, France) + (Madrid, Spain) + (London, England)
= (302 + 301 +270) = 873/3 = 291

The arithmetic mean of the number of stations in the South American subway systems =
(Buenos Aires, Argentina) + (Santiago, Chile)
= (118 + 86)/2

Double this number is = (118 + 86) = 204

291 > 204 ---> YES

2) Order the data by the Number of lines for this question. Then
The number of lines in the New York subway system = 25
The median number of lines = THat of London = 11
25 -11 = 14 > 13 --> YES

3) For this, keep the following formulae in mind
Average Line Length = (Total Line Length) / (Total Number of lines)

THen order the data by the Number of lines. Then
For London --> 11 * 36.55 = 402.05
Examine the data. We can clearly see that for China, 20 * 28.6 = 572.
572 > 402. So Wrong ---> NO
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Good quality question Sajjad1994
I found the 3rd part of the question tricky. Good one. Thanks for creating DI capability on GC. Would also appreciate seeing more expert responses to questions

cc: bb Bunuel
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how can we check without multiplying for the 3rd question related to london?

I just checked Singapore in comparison to london
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cheshire
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You don't need to multiply, it's pretty easy to pick out a city with a longer line. Take Beijing for example, it has about the same average length but double the amount of tracks.
rak08
how can we check without multiplying for the 3rd question related to london?

I just checked Singapore in comparison to london
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