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 l ∩ n?

Explanation:

Step1: Recall set - intersection definition

The symbol $\cap$ represents the intersection of two sets. For two events $L$ and $N$, $L\cap N$ is the set of all elements that are in both $L$ and $N$.

Step2: Analyze Venn - diagram shading

In a Venn - diagram with two overlapping circles representing sets $L$ and $N$, the intersection $L\cap N$ is the overlapping region of the two circles.

Answer:

A.