Question

A scientist analyzed numerous samples of drinking water for the presence of lead and nickel. One sample is chosen at random. Let L be the event that the sample contains lead. Let N be the event that the sample contains nickel. Which Venn diagram is shaded to represent the event ? a. c, B. D.

Answer 1

A

Explanation:

if it is meant literally as stated (lead AND nickel), then the check was only for both to be present.

and then A is the correct answer (L n N : intersection of both sets).

if it would have the typical meaning (we say we check for L and A, but mean inclusive "or" : either L or N or both), then B would be correct.