Answer:
About 14.14
Explanation:
The mean of a data set can be found by adding up all the values in the set and then dividing by the number of values.
1. Add up all the values
The values of the set are: 13, 28, 11, 14, 9, 10, 14
Add them together: 13+28+11+14+9+10+14=99
99
2. Divide by the number of values
In this data set there are 7 values.
Divide 99 by 7
99/7=14.142857142857
Rounded to the nearest hundreth
14.142857142857≈14.14
The mean of the data set is about 14.14