how the hell do I do probability-

Question

Breathless · Answer

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MaxTon · Answer

Read the Venn Diagram. From the diagram: Allowed to date AND has curfew = 55 (middle overlap) Allowed to date but NO curfew = 15, Has curfew but NOT allowed to date = 20, Neither = 10 Check the total: 15 + 55 + 20 + 10 = 100 students. That's your basic information the chart is giving you.

Breathless · Answer

thanks @maxton  do u know what the U means?

MaxTon · Answer

no not really that's All I know

gelphielvr · Answer

This is set notation.  ∪ means union,  ∩ means intersection.

For example:  A ∪ B means everything in A and B;   A ∩ B means the things that are common to A and B. 
- some random Google site 
your paper is kind of blurry for me but this is what U usually means

gelphielvr · Answer

@gelphielvr wrote:

This is set notation. ∪ means union, ∩ means intersection. For example: A ∪ B means everything in A and B; A ∩ B means the things that are common to A and B. - some random Google site your paper is kind of blurry for me but this is what U usually means

not sure what type of math you're in so it might be inaccurate

Lui0210 · Answer

@gelphielvr wrote:

This is set notation. ∪ means union, ∩ means intersection. For example: A ∪ B means everything in A and B; A ∩ B means the things that are common to A and B. - some random Google site your paper is kind of blurry for me but this is what U usually means

So uhh this notion is primarily used in logic and higher level mathematics to do proofs. Which, I don't think applies in this scenario.

gelphielvr · Answer

@lui0210 wrote:

@gelphielvr wrote:

This is set notation. ∪ means union, ∩ means intersection. For example: A ∪ B means everything in A and B; A ∩ B means the things that are common to A and B. - some random Google site your paper is kind of blurry for me but this is what U usually means

So uhh this notion is primarily used in logic and higher level mathematics to do proofs. Which, I don't think applies in this scenario.

yeah I wasn't sure if it applied ...... my computer screen is terrible to the picture is just blur to me

Breathless · Answer

Fr

Lui0210 · Answer

You should try typing out the question(s).

Breathless · Answer

I will lwk resend the pic better once I get to lunch

adrianluvvsyouu2 · Answer

@breathless wrote:

thanks @maxton do u know what the U means?

The U symbol means "or" So P(A U B) means P(A or B). I have a useful diagram here that can help

Breathless · Answer

so like if waffle were 50 and pancakes were 30 and we did (Pancakes U waffles) how would that go?

Breathless · Answer

waffle lovers are 50 pancakes lovers 30 both lovers are 20 and neither are 10

adrianluvvsyouu2 · Answer

@breathless wrote:

waffle lovers are 50 pancakes lovers 30 both lovers are 20 and neither are 10

Okay in this case the formula for P(A U B) is P(A) + P(B) - P(A ∩ B) where ∩ means the OVERLAP or INTERSECTION between the two, this is basically like saying "both" Lets apply that formula to your scenario: P(Pancakes U Waffles) = P(Pancakes) + P(waffles) - P(both pancakes and waffles) So that would be 50 + 30 - 20 = 60 but now we have to divide that by the total population to get the probability. 60/70 = 6/7 or 0.857142 or 85.7142%. Let me know if you need some more explanation as to why we did a step or whatever is confusing you. Otherwise I hope this helps

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