4. (10pts)Lite Snacks Crisp Company's quality control department regularly samples packets of crisps to gauge the average contents. During one production run the results were: Number of Crisps 18 19 20 21 22 23 24 Number of boxes 11 15 61 47 34 22 10 a. Find the mean, median and mode. b. Display the information graphically. (boxplot) c. The company would like to advertise the average number of crisps in a packet. Which figure should be quoted and why? (Assuming there are no legal restrictions on which value is given.)