(2pts) An owner of a convenience store wants to estimate the 95% confidence interval for the average price that convenience stores charge for a popular energy drink. She wants the margin of error for her confidence interval to be, at most, \$0.09. What is the minimum number of convienence stores that she should include in her sample if she uses the standard deviation estimate of $0.32, as reported in the popular press? (Round intermediate calculations to at least 4 decimal places and " z " value to 3 decimal places. Round up your answer to the nearest whole number.)