[填空题]
At the end of a working day, a survey was conducted at a company hfr4,g9)dcr jb)g gmr/ ead offx36jps ydya bi 6j0o90ice asking employees how frequently they jay0oy3j6 6db 9xpis 0take sick leave days per 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.
