Question

Harry Potter is going to the movies for a James Bond movie marathon. The probability that Harry Potter buys a drink is 0.55. The probability that Harry Potter buys popcorn is 0.28. The probability that Harry Potter popcorn or a drink (or both) is 0.74

What is the probability that Harry Potter does not buy a drink to take into the cinema?

What is the probability that Harry Potter buys both a drink and popcorn?
Hint: You will need all given values. A diagram may be helpful here

What is the probability that Harry Potter thinks the prices are outrageous and does not buy anything?

Answer 1

ans) Let be an event that Harry Potter buys a drink and be an event that Harry Potter buys popcorn. Given that and   . The probability that Harry Potter buys a drink or popcorn is   .

a) Harry Potter does not buy a drink is denoted by the event   . Therefore

b) Harry Potter buys both a drink and popcorn is denoted by the event . Therefore

c)  Harry Potter does not buy anything is denoted by the event   . Therefore