The 3 year moving averages for the observations 3, 5, 7, 9, 11 are :

The correct answer is Option (1) → 5, 7, 9

$\text{Moving Average} = \frac{\text{Sum of 3 consecutive terms}}{3}$

$⇒\frac{3+5+7}{3}=\frac{15}{3}=5$

$⇒\frac{5+7+9}{3}=\frac{21}{3}=7$

$⇒\frac{7+9+11}{3}=\frac{27}{3}=9$