Assume that a procedure yields a binomial distribution with $\displaystyle {n}={679}$ trials and the probability of success for one trial is $\displaystyle {p}={20}\%$.

Find the mean for this binomial distribution.
(Round answer to one decimal place.)
$\displaystyle \mu=$

Find the standard deviation for this distribution.
(Round answer to two decimal places.)
$\displaystyle \sigma=$

Use the range rule of thumb to find the minimum usual value μ–2σ and the maximum usual value μ+2σ.
Enter answer as an interval using square-brackets only with whole numbers.
usual values =