In a frequency distribution, the cumulative frequency of the last class is equal to: MCQ with Answer and Explanation

Explanation:
Using a base of 1,000 converts rates to whole numbers (e.g., 120 instead of 0.12), enhancing readability and comparability across age groups and populations without changing the underlying proportion.

Explanation:
P(A∪B)=P(A)+P(B)-P(A∩B). To maximize P(B) given P(A∪B)=0.7 and P(A)=0.4, set P(A∩B)=P(A)=0.4 (i.e., A⊂B). Then 0.7=0.4+P(B)-0.4 => P(B)=0.7 max.

Explanation:
A schedule is completed by an enumerator who records responses during an interview, while a questionnaire is typically self-administered by the respondent, affecting data collection dynamics.