Quote: A Concise Course in Advanced Statistics - Crawshaw, Pg. 277 Question 10.
X~Geo(p) and the probability that the first success is obtained on the second attempt is 0.1275.
If p > 0.5, find P(X > 2).
Textbook ANS: 0.7225
Reminding, Geometric Model:
, And to the limit
r : rth attempt
q : the probability of failure
p : the probability of success
p (the probability of success) is a constant, but I have trouble understanding what p > 0.5 really means from the quoted question above.
Does it means a range of values of p then how to solve the question,
or it just simply requires one constant p = 0.6.
If that is so, there I am trying to solve it as follows:
You are welcome to give your help. Thanks.