Answer:
20
Explanation:
To find the mean, add up all the numbers in the data set, and then divide by the number of terms in the data set
Add
Add up the numbers in the data set
17+24+26+13
80
Divide
Divide by the number of terms in the data set
In this case, there are 4 terms (17, 24, 26, 13)
80/4=20
The mean of the data set is 20