The weighted harmonic mean is used to average: MCQ with Answer and Explanation

Explanation:
An unpublished thesis is a document containing data originally collected by someone else, making it secondary data for another researcher.

Explanation:
Consistency checks ensure no calculated frequency (e.g., from marginal totals) is negative, as counts cannot be negative; all must be non-negative integers for logical validity.

Explanation:
P(X=2) = e^{-4} × 16 / 2 = 8 e^{-4} ≈ 8×0.0183=0.1465.