To find the marginal distribution of females, we look at the total number of females and divide it by the grand total.
From the table:
- Total number of females = 620
- Total number of individuals (both males and females) = 1000
The marginal distribution of females is calculated as:
\[ \text{Marginal distribution of females} = \frac{\text{Total number of females}}{\text{Total number of individuals}} = \frac{620}{1000} = 0.62 = 62.0% \]
Thus, the marginal distribution of females is 62.0%.