Mathematics
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OpenStudy (anonymous):
The probability that it will rain today is 3/8. What is the propability that it will not rain today?
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jimthompson5910 (jim_thompson5910):
P(Rain) + P(Not Rain) = 1
P(Not Rain) = 1 - P(Rain)
OpenStudy (anonymous):
im confused
jimthompson5910 (jim_thompson5910):
the probability that it rains + probability that it doesn't rain = 1
jimthompson5910 (jim_thompson5910):
since those are the only two options
jimthompson5910 (jim_thompson5910):
so we represent it like what I wrote above
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OpenStudy (anonymous):
ok
jimthompson5910 (jim_thompson5910):
to find the answer, simply plug in P(Rain) = 3/8 to get
P(Not Rain) = 1 - P(Rain)
P(Not Rain) = 1 - 3/8
OpenStudy (anonymous):
okay! so cross multiply?
jimthompson5910 (jim_thompson5910):
close, but not really
jimthompson5910 (jim_thompson5910):
1 = 8/8, so
P(Not Rain) = 1 - 3/8
P(Not Rain) = 8/8 - 3/8
Now subtract
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OpenStudy (anonymous):
So 1/4th?
jimthompson5910 (jim_thompson5910):
8 - 3 = ???
OpenStudy (anonymous):
@irishmolly not to butt in but i think you are thinking way to hard
suppose it rains three days out of 8, how many days out of 8 does it not rain?
OpenStudy (anonymous):
*too hard
OpenStudy (anonymous):
4 days???
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OpenStudy (anonymous):
thats my problem i overthink alot of these problems
OpenStudy (anonymous):
three out of eight people in the class are male
how many are female?
OpenStudy (anonymous):
five females
OpenStudy (anonymous):
Boom! Got it :)
OpenStudy (anonymous):
three out of eight days it rains
how many days does it not rain?
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OpenStudy (anonymous):
five days so 5/8?
OpenStudy (anonymous):
yes
OpenStudy (anonymous):
Thank you so much for helping me!!!
OpenStudy (anonymous):
yw