Hello, Starry!
* = ones I think are true
Number 1:
Which are always true?
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All correct . . . Good work!
Number 1
Which are always true?
* P(SUT)=P(S)+P(T)
If S is a subset of T, P(SUT)=P(S)
P(not S)=100%-P(S)
* If S is a subset of T, P(ST)=P(S)
* If S is a subset of T, P(SUT)=P(T)
Number 2
T implies not S. Which are always true?
not S is a subset of T
not T is a subset of S
* S and T are mutually exclusive
*S and T are independent
*not T is a subset of not S
Number 3
P(S) = 90% and P(T) = 55%
Which are always true?
*P(ST)>=45%
P(SUT)>=95%
*T cannot imply S
S and T cannot be mutually exclusive
P(SUT)>=90%
* = ones I think are true
>>>>Can somebody explain which ones I got wrong? <<<
I see...!
so because 90+55-P(ST) <1,
P(ST) would have to be greater than 45!
Thanks!
Also for problem 3, S and T cannot be mutually exclusive right?
How about problem 2?
[thank you sooo much for helping!!! ]