Answer:
Explanation:
Average is calculated by,

Last week, your part-time employees worked 19, 22, 22, 17, and 20 hours, respectively.
Sum = 19 + 22 + 22 + 17 + 20 = 100
Total number of values is 5.
On solving we get


Hence the average number of part-time hours that your employees worked in a week is 20.