The probability of each outcome does not change from trial to trial, and 4. The trials are independent, thus we must sample with replacement. The formulas used to compute the probability, the mean, and the standard deviation of a binomial distribution are as follows. Assume that each TV is made independently of the others. Binomial distributions are a family of distributions.
Tables are available for different combinations of n and p values.
For the tables, refer to the text. Note that the probabilities in each column of the binomial table must add up to 1.0. In the above table, search along the row of p values for 0.30. The X values are graphed along the X axis, and the probabilities are graphed along the Y axis. The skewness is eliminated as n gets large.