The table shows the original distribution of the number of weekly visits made by 20 customers to a community garden. The mean number of weekly visits was 10.
| Number of weekly visits | Frequency |
|---|---|
| 4 | 2 |
| 7 | a |
| 10 | 6 |
| 13 | b |
| 16 | 2 |
One customer's number of weekly visits was originally recorded as 4 but was later corrected to 16. Which choice gives, in order, the mean and the median of the corrected data set?