The solution has to be expressed in different ways, depending on what you have learned. That's part of the reason we require you to show some work: so we can see what kind of work you know about. We want to guide you toward a solution that you are capable of working out yourself.
Do you know about the binomial distribution?
Do you know that the problem is asking for the probability that you get either 3 or 4 heads?
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.