In a frequency distribution, the mid-value of a class is 12 and its width is 6. the lower
limit of the class is:
(a) 6 (b) 9 (c) 12 (d) 18

The american academy of pediatrics wants to conduct a survey of recently graduated family practitioners to assess why they did not choose pediatrics for their specialization. provide a definition of the population, suggest a sampling frame, and indicate the appropriate sampling unit.

If set d is not the empty set but is a subset of set e, then which of the following is true? d ∩ e = d d ∩ e = e d ∩ e = ∅

Interpret the following expression (5y^2-7)^3/(2y)^2