Exam 1

  1. Metainformation

    Tag Value
    fileProbability_uva-expected-value-763-en_uva-expected-value-763-en
    nameuva-expected-value-763-en
    sectionProbability/Elementary Probability/Random variables/Expected value
    typenum
    solution1.2
    tolerance0
    TypeCalculation
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty5.144
    p-value0.0088

    Question

    A closed box contains five balls: three red and two yellow. You pick two balls at the same time at random. Suppose the random variable X is the number of red balls and X can take the values 0,1 and 2. What then is the expectation value of X?


    Solution

    The correct answer is: 1.2