Exam 1

  1. Metainformation

    Tag Value
    fileProbability_uva-addition-rule-681-en_uva-addition-rule-681-en
    nameuva-addition-rule-681-en
    sectionProbability/Elementary Probability/General Rules/Addition rule
    typeschoice
    solutionFALSE, FALSE, TRUE, FALSE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty2
    p-value0.5905

    Question

    Mary and John plan to have three children. There are eight possible outcomes in terms of gender order. MMJ for example, means that the first two children will be girls and the third a boy. Suppose the random variable X is equal to the number of girls. What is then the probability that X = 2?


    1. FALSE: 1/8
    2. FALSE: /1/4
    3. TRUE: 3/8
    4. FALSE: 1/2

    1. 1/8: Incorrect
    2. /1/4: Incorrect
    3. 3/8: Correct
    4. 1/2: Incorrect