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