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How can we assume there are only 100 people , there can be 1000 people in the city.

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Sans8

Third part is not clear to me Sajjad1994 BottomJee pls help
Hi Sans8
I am not an expert but here is how I will try to deduce the last statement:
"At least 45% of Federland citizens under the age of 25 attended both a sporting event and a gallery or museum in 2015."

Let's assume there are 100 people within the 0- 25 age group,
No. of citizens who attended Galleries/ Museums, \(M_1\) = 70 (Given in the table)
No. of citizens who didn't attend Galleries/ Museums, \(M_2\) = 100 - 70 = 30

No. of citizens who attended Sporting events, \(S_1\) = 75 (Given in the table)
No. of citizens who didn't attend Sporting events, \(S_2\) = 100 - 75 = 25

There can be different cases of consideration, but let's take the extreme one i.e. "No one from \(M_2\) is in \(S_2\) and vice versa"
Therefore, no. of people who didn't attend both Galleries/ Museums and Sporting events = \(M_2\) + \(S_2\) = 30 + 25 = 55
So, no. of people who attended both events = 100 - 55 = 45

Hence, even in the extreme case, 45 citizens attended both a sporting event and a gallery or museum. (Can be reasonably inferred)
­

We are given percentages, so the actual number of citizens does not matter. You can assume any convenient number and the result will be the same.

In the solution quoted, 100 was chosen simply because it makes the arithmetic easy. For example, 70 percent becomes 70, 75 percent becomes 75, and so on. If you used 1,000 people instead, you would get 700 and 750, but the overlap percentage conclusion would still be identical.

So the use of 100 is not an assumption about population size, it is only a tool for convenience.
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Hi Bunuel, can you help me with first statement? Are we not able to infer because we really don't know the price charged to different age group. Maybe elder are supposed to pay very high price or vice versa. Secondly, we don't know if even only 45% attended sporting events, they all attended so many sport events, whereas the younger one though high in percentage but attended only one sporting event, so total cost would be low. I just wanna know what reason is being used to reject A.


1. In Federland, per capita spending on sporting events tends to decrease as individuals age.
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Hi Bunuel, can you help me with first statement? Are we not able to infer because we really don't know the price charged to different age group. Maybe elder are supposed to pay very high price or vice versa. Secondly, we don't know if even only 45% attended sporting events, they all attended so many sport events, whereas the younger one though high in percentage but attended only one sporting event, so total cost would be low. I just wanna know what reason is being used to reject A.


1. In Federland, per capita spending on sporting events tends to decrease as individuals age.

Yes, that is the reason.

The table only tells us what percentage of each age group paid to attend at least one sporting event. It does not tell us:

ticket prices for each age group

how many sporting events each person attended

how much each attendee spent

So even if fewer older citizens attended sporting events, they could still have spent more per person by attending more events or paying higher prices.

Therefore, per capita spending cannot be inferred from this table.
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