Question 1

Which of the following is a random variable?

Accepted Answer

All of the choices

Answer

The number of disinfected rooms

Answer

The amount of alcohol consumed

Answer

The speed of a rescue vehicle

Question 2

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

Accepted Answer

$\sqrt{-1}$

Answer

1.7

Answer

$\frac{1}{2}$

Answer

-2

Question 3

Suppose that 2 out of 10 bags delivered by a company is damaged. If a store receives 5 of these bags, then what are the possible values of the random variable 𝑋 representing the number of damaged bags?

Accepted Answer

𝑋 = {0, 1, 2}

Answer

𝑋 = {0, 1, 2, 3}

Answer

𝑋 = {0}

Answer

𝑋 = {0, 1}

Question 4

Which of the following is a possible value of a random variable Y representing the product of the number of heads and number of tails that occur in a toss of a coin?

Accepted Answer

1

Answer

3

Answer

4

Answer

2

Question 5

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

Accepted Answer

Discrete Random Variable

Answer

Continuous Random Variable

Question 6

Which of the following DOES NOT belong to the group?

Accepted Answer

the number of unanswered questions

Answer

the income of a public employer

Answer

the length of service of a worker

Answer

the capacity of a delivery truck

Question 7

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

Accepted Answer

-0.02

Answer

0.26

Answer

0.34

Answer

0.03

Question 8

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

Accepted Answer

1

Answer

-1

Answer

0

Answer

2

Question 9

What should be the value of the missing probability in the table  for it to be a discrete probability distribution?

Accepted Answer

0.39

Answer

0.49

Answer

0.19

Answer

0.29

Question 10

The table  shows the discrete probability distribution of the random variable Y representing the number of SHS students with highest honors per school in Quezon Province in a year. What is the probability that more than 3 SHS students will receive with highest honors?

Accepted Answer

0.24

Answer

0.49

Answer

0.51

Answer

0.10

Question 11

Which of the following should you solve if you are ask to find the expected value of a given random variable?

Accepted Answer

mean

Answer

variance

Answer

standard deviation

Question 12

A random variable X can take only values 1 and 2 with 0.8 and 0.2 probabilities, respectively. What is the mean?

Accepted Answer

1.2

Answer

1

Answer

1.8

Answer

0.5

Question 13

In barangay Masinop, 25% of the teenagers has 1 cellphone and 75% has 2 cellphones. What is the expected number of cellphones that a teenager has in barangay Masinop?

Accepted Answer

1.75

Answer

1.25

Answer

1.5

Answer

0.5

Question 14

What is the total area under the normal curve?

Accepted Answer

1

Answer

100

Answer

10

Answer

0

Question 15

Which value of the standard deviation with equal means will make the normal curve the flattest?

Accepted Answer

$\sigma=1.23$

Answer

$\sigma=1.00$

Answer

$\sigma=1.07$

Answer

$\sigma=1.19$

Question 16

Which of the following is TRUE about a normal distribution?

Accepted Answer

The mean, median, and mode coincide at the center of the curve.

Answer

The normal distribution curve is triangular-shaped.

Answer

The curve is asymmetrical about the mean.

Answer

The curve touches the baseline.

Question 17

Which of the given illustrations shows probability between positive z-scores?

Accepted Answer

https://uploads.quizalize.com/42b8671c-9310-4fb6-a7b0-cd2d02bb712a/question/b4bef0352fe3c643929d1456f4b35a93b326098e.PNG

Answer

https://uploads.quizalize.com/42b8671c-9310-4fb6-a7b0-cd2d02bb712a/question/3733f76afa911cc2bd2de5e60460a791d92e80e6.PNG

Answer

https://uploads.quizalize.com/42b8671c-9310-4fb6-a7b0-cd2d02bb712a/question/44b09d707a5ae1181b6efacf0310ecd4649635fb.PNG

Answer

https://uploads.quizalize.com/42b8671c-9310-4fb6-a7b0-cd2d02bb712a/question/3b2d32705259f985016e466161abf5b05da9ec97.PNG

Question 18

Based from the partial z-table, what is the corresponding area under the normal curve of z = -2.05?

Accepted Answer

0.0202

Answer

0.0062

Answer

0.0060

Answer

0.0207

Question 19

Determine the area under the standard normal curve greater than $z=2.04$.

Accepted Answer

$0.0207$

Answer

$0.0082$

Answer

$0.9793$

Answer

$0.9918$

Question 20

Given that $\mu=8$ and $\sigma=1.2$. Find the equivalent raw score of $z=-1.50$.

Accepted Answer

$6.2$

Answer

$9.8$

Answer

$6.8$

Answer

$9.2$

Question 21

Determine the equivalent $z$-score of $65$ in normal distribution with mean of $45$ and standard deviation of $15$.

Accepted Answer

$1.33$

Answer

$-1.33$

Answer

$-2.33$

Answer

$2.33$

Question 22

In a reading examination, the average score is $95$ with a standard deviation of $18$. What is the probability that the score will be at least $110$?

Accepted Answer

$0.7967$

Answer

$0.2033$

Answer

$0.7939$

Answer

$0.2061$

Question 23

What is the percentile rank of the raw score when $z=0$?

Accepted Answer

$50th$ percentile

Answer

$75th$ percentile

Answer

$100th$ percentile

Answer

$25th$ percentile

Question 24

Supposed that your score in the short quiz has a corresponding negative z-score. Which of the following must be true?

Accepted Answer

Your score must be below average.

Answer

Your score must be better than average.

Answer

Less than 50% of the scores are better compare to yours.

Answer

Most of the scores are lower than your score.

Question 25

In the recent online quiz battle, the scores are normally distributed. The mean score is $30$ with a standard deviation of $5$. Which score is in the $97th$ percentile?

Accepted Answer

$40$

Answer

$38$

Answer

$39$

Answer

$37$

Related quizzes

Related quizzes