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Statistics and Probability ROQ - 1

Quiz by Raymund de la Cruz

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25 questions
Show answers
  • Q1

    Which of the following illustrates a random variable?

    The length of  new-born babies

    The number of students per grade level

    All choices

    The speed of a train

    30s
  • Q2

    What random variable produce set of possible outcomes that is countable?

    both discrete and continuous random variable

    continuous random variable

    none of the choices

    discrete random variable

    30s
  • Q3

    Which of the following random variable belongs to a continuous random variable?

    the number of turnovers made by a team

    the area covered by a basketball court

    the number of free throws made by a player

    the number of timeouts remaining

    30s
  • Q4

    Which of the following DOES NOT belong to the group?

    the temperature of a person entering the mall

    the remaining number of seats in a classroom

    the time it takes to finish taking a bath

    the average points of a basketball player in a season

    30s
  • Q5

    Whichof the following is NOT a possible value of a random variable?

    \sqrt[3]{-8}

    0.99

    \sqrt{-7}

    \frac{1}{3}

    30s
  • Q6

    Suppose that 2 out of 10 bags delivered by a company is damaged. If a store receives 3 of these bags, then what are the possible values of the random variable 𝑋 representing the number of damaged bags?

    X=\left\{0,\ 1\right\}

    X=\left\{0,\ 1,\ 2\right\}

    X=\left\{0,\ 1,\ 2,\ 3\right\}

    X=\left\{0\right\}

    60s
  • Q7

    Which of the following is NOT a possible value of a probability of a value of a random variable in a discrete probability distribution?

    0.94

    -0.25

    0

    1

    30s
  • Q8

    What is the sum of the probabilities in a particular discrete probability distribution?

    -1

    0.5

    0

    1

    30s
  • Q9

    What is the value of the missing probability in the probability distribution?

    Question Image

    0.27

    0.17

    0.83

    1.00

    120s
  • Q10

    The table shows the probability distribution of random variable  representing the number of cellular phones sold in a gadget store. What is the probability that at most 4 cellphones will be sold?

    Question Image

    0.11

    0.15

    0.89

    0.85

    120s
  • Q11

    What should be solved when the expected value is asked?

    mean

    mode

    standard deviation

    variance

    30s
  • Q12

    A random variable  can take only values 2 and 5 with 0.8 and 0.2 probabilities respectively. What is the mean?

    3.6

    2.6

    4.4

    1.0

    300s
  • Q13

    A random variable  can take only values 1 and 2 with 0.8 and 0.2 probabilities respectively. If the mean is 1.2, what is the variance?

    0.16

    0.24

    0.08

    0.32

    300s
  • Q14

    A random variable can take only values 1 and 2 with 0.6 and 0.4 probabilities, respectively. What is the mean?

    1.6

    1.3

    1.4

    1.5

    300s
  • Q15

    In barangay Payapa, 80% of the teenagers has 1 cellphones and 20% has 2. What is the expected number of cellphones that a teenager has in barangay Payapa?

    1.6

    1.0

    1.4

    1.2

    300s

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