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In a poll of 200 people who answered either yes or no to each of two q
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Updated on: 21 Apr 2023, 13:04
Updated on: 21 Apr 2023, 13:04
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45% (02:23) correct
55% (01:31) wrong based on 20 sessions
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In a poll of 200 people who answered either yes or no to each of two questions, 170 people answered yes to the first question and 10 people answered yes to the second question. Which of the following could be the number of people polled who answered no to both questions?
Indicate all that apply
15
18
20
26
32
Can you please solve it with the double matrix method? I got 20 and 26. Are these correct?
Indicate all that apply
15
18
20
26
32
Can you please solve it with the double matrix method? I got 20 and 26. Are these correct?
In a poll of 200 people who answered either yes or no to each of two q
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21 Apr 2023, 14:42
21 Apr 2023, 14:42
Expert Reply
You have 200 people and in the first round 170 say YES and, therefore, 30 say NO.
In the second round, you still have 200 people BUT you have always two groups.
Composed of 170 and the rest, 30 people.
10 say YES therefore 160 say NO.
AND the other group of 30 people, in which 10 say YES and 20 say NO
Taking together, both say NO in the first round are 30 and in the second are 20.
The people who say both NO are between 20 and 30
\(20 \leq \) NO \(\leq 30\)
C and D are the answers
In the second round, you still have 200 people BUT you have always two groups.
Composed of 170 and the rest, 30 people.
10 say YES therefore 160 say NO.
AND the other group of 30 people, in which 10 say YES and 20 say NO
Taking together, both say NO in the first round are 30 and in the second are 20.
The people who say both NO are between 20 and 30
\(20 \leq \) NO \(\leq 30\)
C and D are the answers
Re: In a poll of 200 people who answered either yes or no to each of two q
[#permalink]
22 Apr 2023, 06:12
22 Apr 2023, 06:12
Can you please solve it with a double matrix method?
