Probability distribution pin code guessingby Max.Planck Tags: code, distribution, guessing, probability 

#1
Mar712, 04:57 PM

P: 127

1. The problem statement, all variables and given/known data
What is the distribution of stochastic variable X = "the number of attempts needed to find the correct last digit of a pin code" 2. Relevant equations 3. The attempt at a solution I thought it was like this: P(X=1) = 1/10 P(X=2) = 9/10*1/9 P(X=3) = 9/10*8/9*1/7 ... ... P(X=10) = 9/10*8/9*7/8*6/7*5/6*4/5*3/4*2/3*1/2*1 Thank you! 



#2
Mar712, 05:06 PM

HW Helper
Thanks
P: 4,677

RGV 



#3
Mar712, 06:20 PM

P: 127




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