/soy/ - Soyjaks

3%

13/27?

50% since one is already guaranteed to be a boy

>>17590693
YOOOO I GOT IT RIGHT
I'm gifted and autistic so it checks out

>>17590715
it's 66% you're stupid

>>17590152 (OP)
This is some trick question bullshit isn't it

>>17590693
This teen is right
Consider all the possibilities
Boy tuesday, girl monday
Boy tuesday, girl tuesday
…
Boy tuesday, boy monday
Boy tuesday, boy tuesday

Now keep in mind that every option EXCEPT boy tuesday, boy tuesday has 2 potential orders so they're twice as likely
14 possibilities, 1 of which is half as likely, means the denominator is 13.5
The options for a boy to be picked as the second child is 6.5 (not 7 since boy Tuesday, boy Tuesday) is half as likely
Final answer is 6.5/13.5 = 13/27

>>17590799
aspGODs won

Here's another interview question:
compute E[X>0|X+Y>0] for X,Y iid N(0,1)
can a more educated 'dult help me out? I don't know much about this notation so I assume the answer is 1 (too trivial though)

An easier one; this is something you can do if you know any statistics
>You test 100 trading signals. 5 reject the null at p < 0.05. Are any real?

every game theorist i've met acts like Dilbert it's so fucking weird

>>17590898
X,Y iid N(0,1) means X and Y are independent normal variables with mean 0 and variance 1
This one is harder

>>17590916
Probably not, but it depends on the exact p values, if 4 of them have p=0.04 or some bs and one has p=0.00001 there's a high chance the 5th one is real

>>17590898
Wait is this E[X|X+Y>0] or P(X>0|X+Y>0)? The notation given doesn't make much sense

>>17591031
I don't fucking know bro