There is an interval of 3 between the numbers
1+3=4
4+3=7
7+3=10
10+3=13
13+3=16
16+3=19
19+3=22
22+3=25
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16.
They are 7, 10, 13, 16 and 19.
16 (add 3 every time).
{4} is one example, {4, 13, 4, 16, 4} is another.
Average is a casual word . You need to know the MEAN Mean = {10+12+14+16)/4 mean = 52/4 mean = 13 The answer!!!!