Online customer service is a key element to successful online retailing. according to a marketing survey, 37.5% of online customers take advantage of the online customer service. random samples of 200 customers are selected.

a) what is the population mean of all possible sample proportions?

b) what is the standard error of all possible sample proportions?

c) what percent of the samples are likely to have between 35% and 40% who take advantage of online customer service?

d) what percent of the samples are likely to have less than 37.5% who take advantage of online customer service?

e) fill-in the blanks: 95% of the samples proportions symmetrically around the population proportion will have between % and % of the customers who take advantage of online customer service.