The data shows the number of years that a random sample of 20 employees worked for an insurance company before retirement.
emloyee number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
years worked 8 13 15 3 13 28 4 12 4 26 29 3 10 3 17 13 15 15 23 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. Round your answers to the nearest integer.