A box contains red and green balls. The number of green balls is the number of red balls. If a ball is taken randomly from the box, what is the probability that the ball is red?
Tap an option to check your answer.
1 mark, −0.25StatisticsProbability and Bayes' theoremProbability axioms, events and sample spacesEasyabout 1 min
JNU SSS 2011 Question 52: Probability and Bayes' theorem
Answer and worked solution
Checking your account…
Plain-text version
A box contains red and green balls. The number of green balls is 1/3 the number of red balls. If a ball is taken randomly from the box, what is the probability that the ball is red? (A) 2/3 (B) 1/3 (C) 3/4 (D) None of the above
Probability and Bayes' theorem has come up 190 times in 7 exams since 2004.
What this question tests
This question is on Probability axioms, events and sample spaces, part of Probability and Bayes' theorem in Statistics.
The rules every probability must follow and the vocabulary of events.
TestStop has 15 past-paper questions on this subtopic.
Similar questions from other papers
- Conditional Probability can be calculated by
- In a year of 366 days, what is the chance that three persons have different birthdays?
- If we twice flip a balanced coin, what is the probability of getting at least one head?
- Two cards are drawn from a full pack of 52 cards at random. The probability of getting a heart and a diamond is (*rounded off to two decimal places*).
- In a population of men in a city, 3% are observed to suffer from cancer, 15% are found to be smokers, while 10% are noticed to be either smokers or cancer patients. If…
Question from the JNU SSS 2011 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.