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Probability Old Exam P Forum 

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#22




didnt get 2 get cancelled out when we converted 2 (summation of i>J) to (summation of i not equal to j ) ???

#23




Quote:
lol, I read this going SWEET then looked at the date...damn 
#25




there are 4 mock exams free on http://www.theinfiniteactuary.com now

#26




Hi David,
First of all, thank you for telling me about your free practice exams!!! It is great!!! I had PM you for one question...then I found this thread...good to post here I have trouble with #30 (SE1) which I don't really understand the "question"...and I don't understand the last three lines of your solution neither. Would you please explain it with some details??? Thank you in advance! 
#27




We have 5 variables X_1, X_2, ... X_5 that are uniform on (3, 6). We are ultimately asked to find the probability that the minimum and maximum of our 5 variables are in the interval (4.5  sqrt{0.15}, 4.5 + sqrt{0.15}).
In order for that to happen, all 5 variables must be in that interval. Each variable individually is in that interval with probability (1/3)*[(4.5+sqrt{0.15})  (4.5  sqrt{0.15})] = 2sqrt{0.15}/3. Since the 5 variables are independent, the probability of all 5 being in that interval is [2 sqrt{0.15}/3]^5. 
#28




I see...all of 5 X's in that interval...
Thank you!!! 
#29




Hi David,
I just sent PM to you...according to my personal view of your practice exams... Please check your PM. Hope to hear from you soon 
#30




Hi David,
For #12 of SE4, about your solution #1......what is "Y" with Geo(p=0.5)??? Did you suppose that p(1)=0.5 for Y??? Thank you! 
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the infinite actuary, tia 
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