Math Problem Statement

Find the indicated probability given: P(A) = 0.6, P(B) = 0.7, P(A and B) = 0.25. What is P(A or B)?

Solution

The problem asks for the probability of P(A or B)P(A \text{ or } B), given the following probabilities:

  • P(A)=0.6P(A) = 0.6
  • P(B)=0.7P(B) = 0.7
  • P(A and B)=0.25P(A \text{ and } B) = 0.25

The formula for the probability of P(A or B)P(A \text{ or } B) (which is the probability that either event A or event B happens) is:

P(A or B)=P(A)+P(B)P(A and B)P(A \text{ or } B) = P(A) + P(B) - P(A \text{ and } B)

Substituting the given values:

P(A or B)=0.6+0.70.25P(A \text{ or } B) = 0.6 + 0.7 - 0.25

P(A or B)=1.30.25=1.05P(A \text{ or } B) = 1.3 - 0.25 = 1.05

So, the probability P(A or B)P(A \text{ or } B) is 1.05.

This result suggests the events might overlap significantly. In real-world situations, a probability greater than 1 would usually indicate an issue with the input data, though it is mathematically possible based on how overlapping probabilities are modeled.

Would you like more details or have any questions about this solution?

Here are 5 related questions for practice:

  1. How do you find the probability of two events happening together, P(A and B)P(A \text{ and } B)?
  2. What is the difference between mutually exclusive and non-mutually exclusive events?
  3. How do you calculate the probability of neither event A nor event B happening?
  4. What does a probability greater than 1 indicate in a practical context?
  5. How do conditional probabilities affect the calculation of combined events?

Tip: Always check if the sum of probabilities exceeds 1, as it could indicate data errors or overlapping events.

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Math Problem Analysis

Mathematical Concepts

Probability
Set Theory
Inclusion-Exclusion Principle

Formulas

P(A or B) = P(A) + P(B) - P(A and B)

Theorems

Inclusion-Exclusion Principle

Suitable Grade Level

Grades 9-12