E(C) = k + E(x) , where E(x) is from the Binomial RV pf P(C) and for the Binomial RV. There is an easy thing to remember that you can use to get the Expected value which is E(x) = n*p where n is the number of the questions left or the number of tosses and p is the probability.

Alumni Liaison

Ph.D. 2007, working on developing cool imaging technologies for digital cameras, camera phones, and video surveillance cameras.

Buyue Zhang