A union of restaurant and foodservice workers would like to estimate the mean hourly wage, µ, of foodservice workers in the U.S. The union will choose a random sample of wages and then estimateu using...

Extracted text: A union of restaurant and foodservice workers would like to estimate the mean hourly wage, µ, of foodservice workers in the U.S. The union will choose a random sample of wages and then estimateu using the mean of the sample. What is the minimum sample size needed in order for the union to be 90% confident that its estimate is within $0.40 of µ? Suppose that the standard deviation of wages of foodservice workers in the U.S. is about $2.15. 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 whole number that satisfies the requirements). (If necessary, consult a list of formulas.)