Answer:
10
Step-by-step explanation:
To find the mode of a data set, we need to identify the value that appears most frequently.
In the given data set:
10,16,15,14,8,21,10,5,19,18,4,5,16,12,10,9
10 appears 3 times
16 appears 2 times
15 appears 1 time
14 appears 1 time
8 appears 1 time
21 appears 1 time
5 appears 2 times
19 appears 1 time
18 appears 1 time
4 appears 1 time
12 appears 1 time
9 appears 1 time
So, the mode is 10.
