Probability Distribution: binomial formula
Thirty percent of all customers who enter a store will make a purchase. Suppose that six customers enter the store and that these customers make independent purchase decisions.
a. let x= the number of the six customers who will make a purchase. Write the binomial formula for this situation.
b. use the binomial formula to calculate
1. the probability that exactly five customers make a purchase.
2. the probability that at least three customers make a purchase.
3. the probability that two or fewer customers make a purchase.
4. the probability that at least one customer makes a purchase.