6 11 12 13 14 15 16 17 18 15 A union of restaurant and foodservice workers would like to estimate the mean hourly wage, , of foodservice workers in the U.S. The union will choose random sample of wages and then estimate u using the mean of the sample. What is the minimum sample size needed in order for the union to be 99% confident that its estimate is within $0.45 of u? Suppose that the standard deviation of wages of foodservice workers in the U.S. is about $2.10. Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whol number that satisfies the requirements). (If necessary, consult a list of formulas.) 1 x 6