The arithmetic mean of 10, 20, 30, 40, 50 is: MCQ with Answer and Explanation

Explanation:
A higher crude death rate but lower standardized rate indicates that Population X's apparent higher mortality is due to a larger proportion of elderly people (who have higher death rates), not worse age-specific mortality.

Explanation:
Sum = n(n+1)/2, mean = (n+1)/2.

Explanation:
CBR = (Number of live births in a year / Mid-year population) × 1,000. It is a simple, widely used measure of fertility, though it does not account for age structure.