Using the following table of absolute frequencies, answer the following (you must present the results by attaching an Excel file where each part must be a page of the file):

days of vacation	absolute frequency
0	12
5	15
10	23
12	22
15	21
20	11

1. Convert absolute frequencies to relative frequencies. 2. Obtain the expected value of the discrete distribution. 3. Obtain the variance and standard deviation.