ANSWER
14 days
EXPLANATION
The mean of a data set is the sum of all data, divided by the number of data,
[tex]\bar{x}=\frac{1}{n}\sum_{i\mathop{=}1}^nx_i[/tex]In this case, the number of data is 6, so the mean is,
[tex]\bar{x}=\frac{14+6+18+10+22+14}{6}=\frac{84}{6}=14[/tex]Hence, the mean number of days taken for medical leave each month is 14.