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Computing Mean and Variance of Discrete Random Variable

Quiz by jaime boy alegre

Grade 11-12
Statistics and Probability
Philippines Curriculum: SHS Core Subjects (MELC)

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20 questions
Show answers
  • Q1
    1. It is a random variable that has countable set of possible outcomes.
    probability distribution
    discrete random variable
    random variable
    continuous random variable
    30s
  • Q2
    2. The height and weight of a student-respondent represent what type of random variable?
    continuous random variable
    probability distribution
    discrete random variable
    random variable
    30s
  • Q3
    3. If three coins are tossed, which is not a possible value of the random variable for the number of heads?
    4
    1
    2
    0
    60s
  • Q4
    4. Consider an experiment. If P(X) = x/6 , which of the following values of X will make it a probability distribution?
    0, 1, 2
    1, 2, 2
    1, 2, 3
    2, 3, 4
    60s
  • Q5
    5. The sum of all the individual probabilities of a discrete probability distribution is equal to___.
    2
    3
    4
    1
    30s
  • Q6
    6. P(1) =10/33, P(2) = x ,P(3) =12/33, are the individual probabilities of a given experiment. What should be the value of x to make it a probability distribution?
    1/33
    3
    1/3
    21/33
    120s
  • Q7
    7. Which of the following is not a discrete random variable?
    The speed of a racing car.
    The number of incidents per year in an intersection.
    Total number of dropouts in a school district for a period of 5 years.
    Total siblings in a family of a region.
    30s
  • Q8
    8. Three coins are tossed and the random variable Y gives the number of tails. What could be the values of random variable Y?
    0, 1, 2
    1, 2, 3
    0, 1, 2, 3
    1,2, 3, 4
    30s
  • Q9
    9. Three coins are tossed and the random variable Y gives the number of tails. find the value of P(0) is ____.
    1/8
    1/4
    2/3
    3/8
    120s
  • Q10
    10. Three coins are tossed and the random variable Y gives the number of tails. The value of P(2) should be____.
    2/3
    3/8
    1/8
    1/4
    120s
  • Q11
    11. The sum of the product of each value of a discrete random variable X and its probability is referred to as its _____.
    variance
    mean
    variables
    standard deviation
    30s
  • Q12
    12. Consider the given discrete probability distribution. Find the probability that M equals 5.
    Question Image
    0.48
    0.28
    1
    0.58
    300s
  • Q13
    13. Mang Memong’s bakery has determined a probability distribution for the number of ensaymada it sells in a given day. The distribution is as follows: Find the number of ensaymada that Mang Memong’s bakery expects to sell in a day.
    Question Image
    9.45
    1
    5.25
    5.52
    300s
  • Q14
    14. Let V is denoted as the number of heads in three tosses of a coin. Determine the variance of this random variable.
    3.5
    2.5
    1.5
    0.5
    300s
  • Q15
    15. A random variable Y can take only two values, 2 and 5 such that P(2) = 0. 40 and P(5)= 0.60. Determine the mean of Y.
    2.8
    2.45
    3.8
    3
    120s

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