$2.$ We want to analyze the number of clothing items purchased during the sales. To do this, $20$ people are interviewed, obtaining the following results:

a$)$ Prepare the corresponding frequency table.

b$)$ Graphically represent the frequency distribution.

c$)$ Calculate the average number of clothing items purchased during sales.

d$)$ Obtain the most frequent number of clothing items purchased during sales.

e$)$ Determine the number of items of clothing that at least $50\%$ of people buy on sale