Question
Find the mean of first five multiples of $3$
✓
Answer
The first five multiples of $3$ are $3, 6, 9, 12$ and $15.$
Let $\bar{\text{x}}$ denote their arithmetic mean. Then, $\bar{\text{x}}= (3 + 6 + 9 + 12 + 15) ÷ 5 = 45 ÷ 5 = 9$
Let $\bar{\text{x}}$ denote their arithmetic mean. Then, $\bar{\text{x}}= (3 + 6 + 9 + 12 + 15) ÷ 5 = 45 ÷ 5 = 9$
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