Assume that the given procedure yields a binomial distribution with n trials and the probability of success for one trial is p. Use the given values of n and p to find the mean and standard deviation sigma .

Also, use the range rule of thumb to find the minimum usual value mu minus 2 sigma 2 and the maximum usual value plus 2 sigma

+2. In an analysis of preliminary test results from agender-selection method, 28 babies are born and it is assumed that50% of babies aregirls,

so n=28 and p=0.5