Thread: probability

can anyone solve part (c)?

A coin is weighted in such a way that there is a 70% chance of it landing heads. The coin is tossed three times in succession, find the probability:

c)two heads given that at least one head shows up

Also this is another question;

how do you show that:


thank you

Originally Posted by Heinsbergrelatz

can anyone solve part (c)?

yes

Use binomial to get probabilities for 0, 1, 2, 3 heads.

Prob of at least 1 head = (P1+P2+P3)=A. You want P2/A for exactly 2 or (P2+P3)/A for at least 2.