Exam 1

  1. Metainformation

    Tag Value
    fileProbability_uva-addition-rule-678-en_uva-addition-rule-678-en
    nameuva-addition-rule-678-en
    sectionProbability/Elementary Probability/General Rules/Addition rule
    typeschoice
    solutionFALSE, FALSE, TRUE, FALSE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty2
    p-value0.5905

    Question

    Human blood consists of one of the blood types O, A, B or AB. However the distribution of these blood groups is different in different races. Below is a table showing the probability for each blood group among black people in America:

    ———— —— —— —— —- Blood type O A B AB Odds 0.49 0.27 0.20 ? ———— —— —— —— —-

    John has blood type B and can only safely accept blood transfusions from people with blood type O or B. If we randomly choose a black person choose randomly, what is the probability for John to find suitable blood?


    1. FALSE: 0,20
    2. FALSE: 0,49
    3. TRUE: 0,69
    4. FALSE: 0,76

    1. 0.20: Incorrect
    2. 0.49: Incorrect
    3. 0.69: Correct
    4. 0.76: Incorrect