The average is 18.
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24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
24 for each number you add 5 and then subtract 2. 19 plus 5 is 24.
To determine the pattern in the series 13, 18, 16, 21, 19, we can observe that there are alternating increases and decreases by 5 and 3, respectively. Starting with 13, we add 5 to get 18, then subtract 2 to get 16, add 5 to get 21, and finally subtract 2 to get 19. Following this pattern, the next number would involve adding 5 to 19, resulting in 24.
16
19 + 24 + 20 = 63/3 = 21 The average of the three numbers is 21.