Answer :
To Find: Mean of first six multiples of 3.
Given: First six multiples of 3: 3, 6, 9, 12,15, 18
Concept Used: Mean of data 
Explanation:
Observations: 3, 6, 9, 12, 15, and 18
Sum of observations = 3 + 6 + 9 + 12 + 15 + 18
= 51
Number of observations = 6
Mean = 8.5
Hence, the mean of the first six multiples of 3 is 8.5.
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