Please please help! The data shows the number of years that a random sample of 20 employees worked for an insurance company before retirement.
Employee Number Years Worked
1 8
2 13
3 15
4 3
5 13
6 28
7 4
8 12
9 4
10 26
11 29
12 3
13 10
14 3
15 17
16 13
17 15
18 15
19 23
20 13

The sample mean for the number of years worked is __,
and __% of the employees in the sample worked for the company for at least 10 years. around your answers to the nearest integer.