The table shows the percentage of users of a data tablet who returned the product to an Internet provider within a year after purchase, after a year, and the reasons for the return.



Battery life Monthly service fee New version Totals

Within a year 5% 25% 60% 90%

After a year 1% 3% 6% 10%

Totals 6% 28% 66% 100%

The events of "battery life" and "monthly service fee" are____.



conditional and independent events

conditional and dependent events

dependent events

independent events