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 Jul 22 accepted Average wait time arriving at subway randomly Jul 22 revised Average wait time arriving at subway randomly deleted 49 characters in body Jul 22 awarded Editor Jul 22 revised Average wait time arriving at subway randomly added 49 characters in body Jul 22 comment Average wait time arriving at subway randomly I apologize for the late edit, but a key point that forgot to include is that the trains arrive based on exponential distribution. All answers have been extremely helpful in either of the two cases. Thank you very much. Jul 22 comment Average wait time arriving at subway randomly Phenomenal answer. Thank you. Jul 19 comment Average wait time arriving at subway randomly Thanks Henry. Could you point me in the right direction to learn about how to calculate the expected wait time in the exponential distribution example? Thanks! Jul 19 asked Average wait time arriving at subway randomly May 3 awarded Nice Question Mar 28 comment Why is the eigenvector of a covariance matrix equal to a principal component? Phenomenal answer. Thank you. Mar 28 accepted Why is the eigenvector of a covariance matrix equal to a principal component? Feb 24 asked Why is the eigenvector of a covariance matrix equal to a principal component? Feb 23 awarded Scholar Feb 23 awarded Supporter Feb 23 accepted What is the importance of eigenvalues/eigenvectors? Feb 23 asked What is the importance of eigenvalues/eigenvectors? Feb 8 awarded Student Feb 8 asked What is the characteristic formula for the addition of two lognormal distributions? Feb 7 awarded Teacher Feb 7 answered Prove that if $\gcd( a, b ) = 1$ then $\gcd( ac, b ) = \gcd( c, b )$