First, add all given fractions = 1/2+1/5+1/10
= 5/10 + 2/10 + 1/10
= 8/10
Now, Divide this sum of the fractions by the number of values in the set ie., 3:
8/10 ÷ 3
= 8/10 * 1/3
= 8/30 = 0.26666
Thus, the average of the given set of fractions is 0.266667.