She tries her passwords until she finds the right one. Let X be the number of wrong
passwords she uses before she finds the right one. Find E(X) and Var(X).
Tuesday, December 29, 2015
3.8. A computer user tries to recall her password. She knows it can be one of 4 possible passwords. She tries her passwords until she finds the right one. Let X be the number of wrong passwords she uses before she finds the right one. Find E(X) and Var(X)
3.8. A computer user tries to recall her password. She knows it can be one of 4 possible passwords.
She tries her passwords until she finds the right one. Let X be the number of wrong
passwords she uses before she finds the right one. Find E(X) and Var(X).
She tries her passwords until she finds the right one. Let X be the number of wrong
passwords she uses before she finds the right one. Find E(X) and Var(X).
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This is wrong solution as x may vary from 0 to infinity.
ReplyDeleteI am not good at math but the question stats that she knows it's one of the 4 words. so she only can get it wrong 3 times at max
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