A fair die is rolled. Find \(P(\text{prime})\).

Answer: \(\frac{3}{6}=\frac12\) (2,3,5).

A bag has 4 red and 6 blue balls. Find \(P(\text{not red})\).

Answer: \(\frac{6}{10}=\frac35\).

For independent events, \(P(A)=0.3,P(B)=0.4\). Find \(P(A\cap B)\).

Answer: \(0.12\).

An event occurs 18 times in 50 trials. Estimate probability.

Answer: \(\frac{18}{50}=0.36\).

Checkpoints