To answer this question we can use the following formula in Excel. N is the fixed number of trials. Binomial mean and standard deviation formulas.
HH heads 1st heads 2nd HT TH or TT.
P X3 P X 3. B binomial probability x total number of successes pass or fail heads or. N x is the number of failures. The random variable X has a binomial distribution with index n 5 and parameter th 0.