3. Table A-1 Because the binomial probabilities in Table A-1 are so easy to find, why don’t we use that table every time that we need to find a binomial probability?

and the counting rule for the number of arrangements of n items when x of them are identical to each other and the other n  x are identical to each other. (See Exercises 13 and 14.)

Psxd 5 n!

sn 2 xd!x!

? px ? qn2x The number of outcomes with exactly x successes among n trials The probability of x successes among n trials for any one particular order 2 2 5-3 Binomial Probability Distributions 221