Exam 1

  1. Metainformation

    Tag Value
    fileProbability_uva-general-rules-1163-en_uva-general-rules-1163-en
    nameuva-general-rules-1163-en
    sectionProbability/Elementary Probability/General Rules
    typeschoice
    solutionFALSE, TRUE, FALSE
    TypeConceptual, Calculation
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty2
    p-value0.5905

    Question

    Research indicates that the percentage of spam is about 60% of all e-mail is. Define the random variable X as: the number of spam messages in your e-mail box. Suppose you randomly choose two emails, which probability distribution of X below is correct?


    1. FALSE: P(X=1) = 0.48; P(X=2) = 0.36
    2. TRUE: P(X=0) = 0.16; P(X=1) = 0.48; P(X=2) = 0.36
    3. FALSE: P(X=0) = 0.40; P(X=1) = 0.60; P(X=2) = 0.60

    1. P(X=1) = 0.48; P(X=2) = 0.36: Incorrect
    2. P(X=0) = 0.16; P(X=1) = 0.48; P(X=2) = 0.36: Correct
    3. P(X=0) = 0.40; P(X=1) = 0.60; P(X=2) = 0.60: Incorrect