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Mathematical Reasoning Drill 4, Problem 2. How many people failed to return the survey?
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Sets a la Venn 453 Views
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Description:
Learn about Venn diagrams with Priscilla the ugly chinchilla, as she categorizes her chinchilla friends into sets based on a survey they took.
Transcript
- 00:00
Sets, a la Shmoop. This is Priscilla.
- 00:08
Priscilla is an ugly chinchilla.
- 00:09
Yeah, we know it's supposed to be "ugly duckling," but chinchillas are more fun.
- 00:13
And they take it less personally. Priscilla is obsessed with sets -- groups
- 00:16
of numbers, objects or variables...
Full Transcript
- 00:19
... that help us see relationships and differences between various elements.
- 00:23
She wanted to see what her ugly chinchilla friends had grown up to be, so she surveyed
- 00:27
eighty-three formerly ugly chinchillas.
- 00:30
The survey results came back:
- 00:33
Chinchilla Coat. Road kill.
- 00:35
And... swan.
- 00:37
Priscilla arranged her set of information into a circle diagram, also known as a Venn
- 00:41
Diagram.
- 00:43
Some chinchillas had become more than one thing.
- 00:45
Can you determine how many formerly-ugly chinchillas became swans?
- 00:49
Hook Priscilla up with the correct answer.
- 00:52
To find out how many chinchillas became swans, we need to first identify the Swan Circle.
- 00:58
No. Awesome, but no.
- 01:01
Bingo!
- 01:02
Now add together all the pieces of the diagram in the Swan Circle:
- 01:06
12 + 6 + 3 + 9 = 30
- 01:10
Hey there, choice C. Priscilla's diagram tells us that thirty out
- 01:15
of the eighty-seven formerly-ugly chinchillas became swans.
- 01:19
Just remember, Priscilla - no chinchilla looks ugly taking a dust bath.
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