11 Table 5.18 shows the wages paid last week to 45 part-time employees of a supermarket chain. Find the mean and the median wage. Table 5.18 Data for Question 11 Wages (Es) No. of employees 20 to under 30 NO 30 to under 40 4 19 40 to under 50 6 50 to under 60 2 60 to under 70 1 1 70 to under 80 9 80 to under 90 45