Question

When randomly selecting an adult, let B represent the event of

randomly selecting someone with type B blood. Write a sentence describing what the rule of
complements is telljng us: P(B or
¯
B
) = l.

Answer 1

P (B or B’)=1 means that an adult is certain to have a blood type B or an adult doesn’t have a blood type B .

Explanation:

Given the information from the question. Let B = the event of randomly selecting an adult with a blood type B.

Know the complement rule in probability theory. The B’ (B complement) is the event that an adult doesn’t have a blood type B.

To answer the question. P (B or B’)=1 means that an adult is certain to have a blood type B or an adult doesn’t have a blood type B .