Answer:
5th term: 18
Step-by-step explanation:
Mean = sum of data/number of data
Term 1: 13
Term 2: 21
Term 3: Mean of term 1 and term 2
13+21/2 = 17
Term 4: Mean of term 2 and term 3
21+17/2 = 19
Term 5: Mean of term 3 and term 4
17+19/2 = 18
Therefore, the fifth term in the sequence is 18.
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