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Stats Question
Real estate ads suggest that 63% of homes for sale have garages, 21% have pools, and 18% have both features. What is the probability that a home for sale has:
a) A pool or garage?
b) Neither a pool or garage?
c) A pool but no garage?
 one year ago
 one year ago
Stats Question Real estate ads suggest that 63% of homes for sale have garages, 21% have pools, and 18% have both features. What is the probability that a home for sale has: a) A pool or garage? b) Neither a pool or garage? c) A pool but no garage?
 one year ago
 one year ago

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mariomintchevBest ResponseYou've already chosen the best response.0
For a I have to use the formula: P(A) + P(B)  P(A n B) =
 one year ago

mariomintchevBest ResponseYou've already chosen the best response.0
Yeah, my teacher drew that out for us today. I don't really get what goes in the formula for part a though.
 one year ago

PolrekBest ResponseYou've already chosen the best response.1
So the entire garage circle is 63% and the entire Pool circle is 21%. But these two percentages also contain the percentage of houses which have both. So you should add together the 63% and the 21%, and subtract the 18%, which is the intersection of A and B.
 one year ago

mariomintchevBest ResponseYou've already chosen the best response.0
yeah i see that now.
 one year ago

mariomintchevBest ResponseYou've already chosen the best response.0
for b, do i take 37 + 79 and then subtract 82?
 one year ago

PolrekBest ResponseYou've already chosen the best response.1
I think you should just take the complement of your answer to A.
 one year ago

PolrekBest ResponseYou've already chosen the best response.1
66% of houses have either a pool or a garage, so (10.66) = 0.44 will have none of these.
 one year ago

mariomintchevBest ResponseYou've already chosen the best response.0
i am given this formula though: P(A)=1P(A^c)
 one year ago

PolrekBest ResponseYou've already chosen the best response.1
Yeah, so 1P(A)' = P(A), and this works the other way. 1P(A) = P(A)'
 one year ago

mariomintchevBest ResponseYou've already chosen the best response.0
it's 0.34. you subtracted wrong.
 one year ago

PolrekBest ResponseYou've already chosen the best response.1
Haha oh dear, more coffee required. Sorry. Do you get the idea though?
 one year ago

mariomintchevBest ResponseYou've already chosen the best response.0
yeah, i'm getting it slowly but surely. this is my first time taking stats and i just started, so i'm getting used to it.
 one year ago

PolrekBest ResponseYou've already chosen the best response.1
My advice is to get the hang of drawing those Venn Diagrams. They are really helpful.
 one year ago

mariomintchevBest ResponseYou've already chosen the best response.0
can you help me with part c too?
 one year ago

PolrekBest ResponseYou've already chosen the best response.1
This area, right? dw:1346194888234:dw
 one year ago

mariomintchevBest ResponseYou've already chosen the best response.0
is it 0.210.18?
 one year ago
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