Question

Answer the following as a decimal rounded to two decimal places.Given:P (A) = 0.45P (B) = 0.5P (A and B) = 0.25Find: P(A or B) =

Answer 1

0.7

Explanation:

We can calculate the value of P(A or B), using the following formula:

`\begin{gathered} \text{ P\lparen A or B\rparen = P\lparen A\rparen + P\lparen B\rparen - P\lparen A and B\rparen} \\ \\ \text{ We replacing:} \\ \\ \text{ P\lparen A or B\rparen = }0.45+0.5-0.25 \\ \\ P\left(A\text{ }or\text{ }B\right)=0.7 \end{gathered}`

Therefore, the value of P(A or B) is equal to 0.7