Question

can u pls help this out..A random variable X has the probability distribution value 1 2 3 4 probability 0.5 0.25 0.125 0.125 (For those of you who are interested, this is the geometric p=0.5 “killed” at 4. X is the number of times I toss a coin if I follow this rule: I’ll toss the coin till I get the first head, but I’ll stop after 4 tosses even if I haven’t got a head by that time.) Find E(X)

Answer 1

\[E(X)= \sum_{1}^{4}P i X i\]

Answer 2

v1*p1+v2*p2+v3*p3+v4*p4