A hair stylist has been in business one year. Fifty percent of his customers are walk-in business. If he randomly samples nine of the people from last week’s list of customers, what is the probability that three or fewer were walk-ins? If this outcome actually occurred, what would be some of the explanations for it?

The probability that three or fewer were walk-ins is P=0.254.

If this outcome occured, it can be produced by pure chance, as it nos a very unlikely event, although the expected number of walkins is 4.5.

Step-by-step explanation:

This problem can be modeled as a binomial experiment, with p=0.5 and n=9.

p is the probability that the customers are walk-ins.

n is the sample size.

We have to calculate the probabilty that three or fewer are walk-ins.