The mean of these numbers is 13.83 hours (14 hours to the nearest whole number)
Here, we want to calculate the mean number of hours
To do this, we simply add all the numbers and divide by the count of the numbers
The count of the numbers is 6
Thus, we have the calculation as follows;
[tex]\frac{(15+14+20+17+6+11)}{6}\text{ = }\frac{83}{6}\text{ = 13.83}[/tex]