[填空题]
At the end of a workiqla1w ecu 6/ ma8 b6kgz,r*qt8m 8uom5c1v1ig sf,em9-(sx xdj al.3o ng day, a survey was conducted at a company head office asking employees how frequently they take sick leave days perv3af(lc xod,esx- m1 .gi19js year.
The data is shown in the following table.
1. State whether the data is discrete or continuous.
The mean number of sick leave days per year is 4 .
2. Find the value of k .
In this survey, these employees were arranged in alphabetical order and every 5th person was asked for the number of sick leaves per year.
3. Identify the sampling technique used in the survey.
