## 2012 Errata

May 16th, 2012

I’ve fixed 6 errors in the 2012 problems/solutions. The handouts are updated, but if you don’t want to re-download them, here are the changes:

A.1 # 15: in the example realizing the minimum, P[A'B'] should be 0, not 0.1.

A.2 # 5: P[D] = 0.274, not 0.247. I used 0.274 in the following calculations, so nothing else is affected.

A.3 #13 and #14: the exponent in the numerator should be inside the [ ].

A.4 Solution to #31, the (1/2)^2 in the denominator should be (1/2)^3

B.1 # 15 I took the wrong square root: y>a, so we want E.

B.6 # 20 theta=8.5, but the problem asks for E[X], which is 2*theta/3 = 5.7

Video solutions to B.1#15 and B.6 #20 aren’t yet updated.

A.2 conditional solutions #9: It should be P[both are same colors] = {6/10}*{b/(b+16)} + {4/10}*{16/(16+b)}