If events A and B are mutually exclusive, then:

In a scientific laboratory, 85% of the experiments are related to biology, while the remaining 15% are related to chemistry. Suppose that the probability of a laboratory assistant accurately documenting the experiment does not depend on the experiment's type. However, whenever an experiment is documented, the laboratory assistants correctly record the experiment's field in 80% of the cases and mistakenly label it as a different field in 20% of the cases.

What is the probability that a lab assistant labels an experiment as a biology experiment?

A random experiment gave rise to the two-way contingency table shown. 

Events L and R are: