The owner of a drug store would like to estimate the percentage of customers who buy vitamins. Based on observation, the owner believes that the percentage is between 43% and 634. To construct a 95%% confidence interval for the true proportion of customers who buy vitamins, how many customers should be chosen if the owner would like the error of the estimate to be no more than 0.067 Select one: a. 534 O b. 262 10 0 267 O d. 249 Qe 459