Gr 12 Math Lit: Ch 3.1 Probability
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Questions and Answers

What is the probability of an impossible event?

  • 0 (correct)
  • 1
  • 0.25
  • 0.5

    • What is the probability of rolling an even number on a dice?

  • 2/3
  • 1/4
  • 1/2 (correct)
  • 1/3

    • What is the probability of not rolling a specific number on a dice?

  • 2/3
  • 5/6 (correct)
  • 1/2
  • 1/6

    • What is the probability of heads when tossing a coin?

    <p>1/2</p> Signup and view all the answers

    What is the term for the number of times an event occurs?

    <p>Frequency</p> Signup and view all the answers

    What is the term for an event that occurs without any bias or pattern?

    <p>Random</p> Signup and view all the answers

    What is the term for a single attempt or realization of a probability experiment?

    <p>Trial</p> Signup and view all the answers

    What is the probability of an event that will definitely happen?

    <p>1</p> Signup and view all the answers

    What is the purpose of tree diagrams?

    <p>To visualize all possible outcomes of combined events</p> Signup and view all the answers

    What is represented by each cell in a two-way table?

    <p>A possible combined outcome</p> Signup and view all the answers

    What is the basis of weather predictions?

    <p>Both historical data and current measurements</p> Signup and view all the answers

    What is a false positive result?

    <p>A test result that indicates a positive result when it is actually negative</p> Signup and view all the answers

    How can the accuracy of predictions be improved?

    <p>By collecting more data over time</p> Signup and view all the answers

    What should be considered when analysing probability in media?

    <p>The accuracy of sources and data used, as well as the sample size</p> Signup and view all the answers

    What is the probability of an event that is certain to happen?

    <p>1</p> Signup and view all the answers

    What is the probability of rolling a fair dice and getting an odd number?

    <p>1/2</p> Signup and view all the answers

    What do tree diagrams help to visualize?

    <p>All possible outcomes of combined events</p> Signup and view all the answers

    A bag contains 5 red balls, 3 blue balls, and 2 green balls. What is the probability of randomly selecting a blue ball?

    <p>3/10</p> Signup and view all the answers

    In a two-way table, what does each cell represent?

    <p>A combination of two possible outcomes</p> Signup and view all the answers

    A company claims that their new medicine has a 90% success rate. What is the probability that it will not work for a patient?

    <p>0.1</p> Signup and view all the answers

    What do probabilities in weather forecasts indicate?

    <p>The likelihood of certain weather conditions</p> Signup and view all the answers

    What is the main purpose of understanding probability?

    <p>To interpret and predict various real-life situations</p> Signup and view all the answers

    What is a consequence of a false positive result?

    <p>A person is unnecessarily treated for a disease</p> Signup and view all the answers

    A student rolls a fair dice 6 times. What is the probability that the student gets exactly 2 sixes?

    <p>Not enough information</p> Signup and view all the answers

    What is the probability of rolling a fair dice and getting a number less than 3?

    <p>1/2</p> Signup and view all the answers

    Why is it important to consider the sample size when analysing probability in media?

    <p>To determine the accuracy of the data</p> Signup and view all the answers

    What is the benefit of collecting more data over time when making predictions?

    <p>It increases the accuracy of the predictions</p> Signup and view all the answers

    A Pregnancy test has a 95% accuracy rate for positive results. What is the probability that the test is incorrect for a person who is not pregnant?

    <p>0.05</p> Signup and view all the answers

    In a game of chance, what is the probability of an event that has three favourable outcomes out of nine possible outcomes?

    <p>3/9</p> Signup and view all the answers

    A probability experiment has four possible outcomes, and two of them are favourable. What is the probability of the event not occurring?

    <p>3/4</p> Signup and view all the answers

    A probability experiment has eight possible outcomes, and three of them are favourable. What is the probability of the event occurring?

    <p>3/8</p> Signup and view all the answers

    A coin is tossed three times, and the probability of getting heads on each toss is 0.5. What is the probability of getting exactly two heads?

    <p>3/8</p> Signup and view all the answers

    A fair six-sided dice is rolled, and the probability of rolling an even number is 0.5. What is the probability of rolling an odd number?

    <p>1/2</p> Signup and view all the answers

    A probability experiment has five possible outcomes, and two of them are favourable. What is the probability of the event occurring if it is considered a fair experiment?

    <p>2/5</p> Signup and view all the answers

    A company claims that their new product has a 0.8 probability of success. What is the probability that it will not work?

    <p>0.2</p> Signup and view all the answers

    What is the primary advantage of using tree diagrams to represent combined events?

    <p>They provide a visual representation of all possible outcomes and their probabilities.</p> Signup and view all the answers

    In a two-way table, what is the relationship between the cells and the probabilities of combined events?

    <p>Each cell represents a combined outcome, and the probabilities are calculated from the table.</p> Signup and view all the answers

    A weather forecast predicts a 70% chance of rain. What is the probability that it will not rain?

    <p>0.3</p> Signup and view all the answers

    What is the primary difference between a false positive and a false negative result?

    <p>A false positive is when a test indicates a positive result, but the actual outcome is negative, and a false negative is when a test indicates a negative result, but the actual outcome is positive.</p> Signup and view all the answers

    When analyzing probability in media, what is an important consideration to ensure the accuracy of predictions?

    <p>All of the above.</p> Signup and view all the answers

    What is the benefit of using historical data and current measurements to make weather predictions?

    <p>It enables more reliable forecasts based on past trends and patterns.</p> Signup and view all the answers

    Why is it important to evaluate the sample size used for predictions when analyzing probability in media?

    <p>To ensure that the sample is representative of the population.</p> Signup and view all the answers

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