BAED-STAT2112 Statistics and Probability
Determine what type of random variable is represented in the given scenario.
“The amount of time represents a task.”
Continuous random variables
The normal curve is often called Gaussian distribution.
-True
These are the most important characteristics of any probability distribution.
-Mean and standard deviation
Determine what type of random variable is represented in the given scenario.
“Number of television per household”
-Discrete random variables
It is useful for describing the number of events that will occur during a specific interval of time or in a
specific distance, area, or volume.
-Poisson Experiment
The normal distribution is unimodal.
-True
This is a complete description of all the possible values of the random variable, along with their
associated probabilities.
-Probability Distribution
When you roll the two dice, what is the probability that the sum is 9?
-1/9
These are random variables that can take on any of the countless number of values in an interval.
-Continuous random variables
DOLE found that 83% of Filipinos think that having a college education is important to succeed in life. If a
random sample of 7 Filipinos is selected, find the probability that exactly 4 will agree with that
statement.
-0.0816
Random means that the experiment may result in one of several possible values of the variable.
-True
What is the probability that the total of two dice will be greater than 9, given that the first die is a 5?
-1/3
Determine what type of random variable is represented in the given scenario.
“Weight of the employees in a call center company”
-Continuous random variables
DOLE found that 83% of Filipinos think that having a college education is important to succeed in life. If a
random sample of 7 Filipinos is selected, find the probability that at most two people will agree with
that statement.
-0.0021
Five hundred raffle tickets are sold at ₱25 each for three prizes of ₱4,000, ₱2,500, and ₱1,000. After
each prize drawing, the winner ticket is then returned to the collection of tickets. What is the mean or
expected value if a person purchases four tickets?
x
₱3,900
₱2,400
₱900
-₱100
P(x)
4/500
4/500
4/500
496/500
- -₱41.60
It is a mapping or list of all values of a random variable to their corresponding probabilities for a given
sample space.
-Probability Distribution
These are random variables that can assume all values between any two specific values.
-Continuous random variables
It represents the numerical value of a simple event of an experiment.
-Random variables
The experiment consists of counting the number of events that will occur during a specific interval of
time or in a specific distance, area, or volume.
-Poisson Experiment
When you roll the two dice, what is the probability that the sum is 4?
-1/12
The area under the part of a normal curve that lies within one standard deviation of the mean is
________.
-about 68%
It is applied when the probability of success are not the same from trial to trial.
-Hypergeometric Experiment
The normal distribution is continuous.
-True
A vintage car breaks down an average of four times per month. Find the probability that during the next
month this vintage card will have at most two breakdowns.
-0.2381
Five balls numbered 1, 2, 3, 4, and 5 are placed in a box. One is selected, its number is noted and then it
is replaced. If this experiment is repeated many times, find the variance of the numbers on the balls.
-2
The area under the part of a normal curve that lies within two standard deviation of the mean is
________.
-about 95%
The experiment consists of n independent, identical trials
-Binomial Experiment
The normal distribution is bell-shaped.
-True
It is the set of all possible outcomes of a probability experiment.
Sample space
The probability of success remains the same from trial to trial.
-Binomial Experiment
A package of 8 AAA size batteries contains 2 that are defective and 6 that are non – defective. If we
select 4 batteries at random from the package, what is the probability that the sample contains exactly 1
defective battery?
-57.14%
It is a numerical measure of the likelihood that a specific event will occur.
-Probability
Five balls numbered 1, 2, 3, 4, and 5 are placed in a box. One is selected, its number is noted and then it
is replaced. If this experiment is repeated many times, find the standard deviation of the numbers on
the balls.
-1.41
These are random variables that can assume only a countable number of values.
-Discrete random variables
It is the square root of the variance.
-Standard deviation
The most common way to measure the spread of a normal distribution.
-Standard deviation
It is a function or rule that assigns a number to each outcome of an experiment.
-Random variable
Determine what type of random variable is represented in the given scenario.
“Number of DVD monthly sales in a Video Center”
-Discrete random variables
It is a measure of the number of standard deviations a particular data point is away from the mean.
-z-score
It is a perfectly symmetric, mound-shaped distribution.
-Both A and B
Determine what type of random variable is represented in the given scenario.
“Outcomes in rolling a pair of dice”
-Discrete random variables
The area under the part of a normal curve that lies within three standard deviation of the mean is
________.
-about 99.7%
It is commonly referred to as a normal curve, or bell curve.
-Normal Distribution
The normal distribution curve is symmetric about the mean.
-True
It is a result of a single trial of a probability experiment.
-Outcome
There are only two possible outcomes for each trial, success and failure.
-Binomial Experiment
The mean, median and mode have different values in a normal distribution.
-False
Five balls numbered 1, 2, 3, 4, and 5 are placed in a box. One is selected, its number is noted and then it
is replaced. If this experiment is repeated many times, find the mean of the numbers on the balls.
-3
The normal curve is asymptotic.
-True
It is a measure of how spread out the values are.
-Standard deviation