The data set shows the amount of Alvin's monthly savings last year.
$7, $12, $10, $12, $15, $11, $8, $9, $11, $11, $13, $10
1. Find Alvin's median monthly savings.
2. Find Alvin's mean monthly savings.
3. If Alvin had saved $1 more every month, what are his new median and new mean monthly savings?