Question 1

Which of the following illustrates a random variable?

Accepted Answer

All choices

Answer

The length of new-born babies

Answer

The number of students per grade level

Answer

The speed of a train

Question 2

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

Accepted Answer

discrete random variable

Answer

both discrete and continuous random variable

Answer

continuous random variable

Answer

none of the choices

Question 3

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

Accepted Answer

the area covered by a basketball court

Answer

the number of turnovers made by a team

Answer

the number of free throws made by a player

Answer

the number of timeouts remaining

Question 4

Which of the following DOES NOT belong to the group?

Accepted Answer

the remaining number of seats in a classroom

Answer

the temperature of a person entering the mall

Answer

the time it takes to finish taking a bath

Answer

the average points of a basketball player in a season

Question 5

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

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 6

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?

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

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

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 8

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

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 9

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

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 10

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?

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 11

What should be solved when the expected value is asked?

Accepted Answer

mean

Answer

mode

Answer

standard deviation

Answer

variance

Question 12

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

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 13

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?

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 14

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

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 15

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?

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 16

Which of the following is equivalent to the square root of the variance?

Accepted Answer

standard deviation

Answer

mean deviation

Answer

none of the choices

Answer

normal deviation

Question 17

Which of the following is TRUE about a normal distribution?

Accepted Answer

The curve is symmetrical about the mean.

Answer

The normal distribution curve is triangular-shaped.

Answer

The mean, median, and mode are different.

Answer

The curve touches the baseline.

Question 18

What is the area under the normal curve above $z=0$ ?

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 19

Which of the following is the area under the normal curve above $z=2.25$ ?

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 20

What is $z=0$

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 21

What is the equivalent z-score of 38 in normal distribution with mean of 40 and standard deviation of 2.

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 22

What is the equivalent raw score of $z=0$ in a normal distribution with mean of $75$ and standard deviation of $4$ ?

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 23

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

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 24

In the recent online quiz battle, the scores are normally distributed. The mean score is 20 with a standard deviation of 2. Which score is in the 85^th percentile?

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Question 25

In a Science examination, the average score is $z=0$ with a standard deviation of $75$ . What is the probability that the score will be at least $4$ ?

Accepted Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

Answer

$\sqrt{-7}$

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