Math 1280 Final Exam | Verified Exam Questions and Answers | Latest
Updated Study Material 2026
Question:
You are interested in the number of English-speaking people on the planet who want to play a
new kind of online video game. You asked 300 college students if they were interested in
playing video games, 100 said yes, and of them 20 preferred your game to an existing game that
is widely used. How many people were in the sample?
Select one: a. The number of English-speaking people on the planet who want to play a new kind
of online video game. b. 300 c. 200 d. 100 e. 20
Answer:
b
Question:
What is the mean of x? x <- c(12, 14, 11, 14, 13, 15, 12, 16, 10)
Select one: a. 12 b. 13 c. 14 d. 15 e. 16
Answer:
b
Question:
Using the value of x from the prior question, what is the standard deviation of x?
Select one: a. 1 b. 3.75 c. 9 d. sqrt(13) e. 1.94
Answer:
e
Question:
There was a very short quiz with five questions. The following table shows the number of
Answer:
s and the cumulative relative frequency for those scores in the class. value: 2 3 4 5
cumulative relative frequency: .13 .55 .925 1 What is the probability that a randomly selected
student from the class scored a 3 on the short quiz?
Question:
Select one: a. .13 b. .42 c. .55 d. .375 e. .925
, Answer:
b
Question:
Use this information for the next three questions. A random variable called L is defined by the
following table, but one of the relative frequencies is missing: value: -5 0 1 3 8 relative
frequency: .17 .11 .23 .15
Answer:
Question:
Which distributions are discrete?
Select one: a. the normal distribution and the Poisson distribution. b. the Poisson distribution, the
binomial distribution, and the uniform distribution. c. the binomial distribution and the
exponential distribution. d. the Poisson distribution, the binomial distribution, and the normal
What is the expected number of successes (balloons popped) when throwing 5 darts (rounded to
two decimal places)?
Select one: a. 1.41 b. 1.00 c. 2.50 d. 0.75 e. 0.50
Answer:
d
Question:
What is the probability of getting 4 or more successes (popped balloons) in 5 throws (rounded to
two decimal places)?
Select one: a. .00 b. .98 c. .07 d. .33 e. .12
Answer:
a
Question:
A Poisson distribution called Q has an expectation of 4. Which of the following R commands
would tell you the probability that a randomly selected value from Q is less than 6 and greater
than or equal to 4 (read the question carefully):
Select one: a. ppois(6, 4) - ppois(3, 4) b. ppois(6, lambda=4) - ppois(4, lambda=4) c. ppois(5, 4) -
ppois(3, 4) d. ppois(5, 4) - ppois(4, 4) e. ppois(6 - 4, lambda=4)
Answer:
c
Updated Study Material 2026
Question:
You are interested in the number of English-speaking people on the planet who want to play a
new kind of online video game. You asked 300 college students if they were interested in
playing video games, 100 said yes, and of them 20 preferred your game to an existing game that
is widely used. How many people were in the sample?
Select one: a. The number of English-speaking people on the planet who want to play a new kind
of online video game. b. 300 c. 200 d. 100 e. 20
Answer:
b
Question:
What is the mean of x? x <- c(12, 14, 11, 14, 13, 15, 12, 16, 10)
Select one: a. 12 b. 13 c. 14 d. 15 e. 16
Answer:
b
Question:
Using the value of x from the prior question, what is the standard deviation of x?
Select one: a. 1 b. 3.75 c. 9 d. sqrt(13) e. 1.94
Answer:
e
Question:
There was a very short quiz with five questions. The following table shows the number of
Answer:
s and the cumulative relative frequency for those scores in the class. value: 2 3 4 5
cumulative relative frequency: .13 .55 .925 1 What is the probability that a randomly selected
student from the class scored a 3 on the short quiz?
Question:
Select one: a. .13 b. .42 c. .55 d. .375 e. .925
, Answer:
b
Question:
Use this information for the next three questions. A random variable called L is defined by the
following table, but one of the relative frequencies is missing: value: -5 0 1 3 8 relative
frequency: .17 .11 .23 .15
Answer:
Question:
Which distributions are discrete?
Select one: a. the normal distribution and the Poisson distribution. b. the Poisson distribution, the
binomial distribution, and the uniform distribution. c. the binomial distribution and the
exponential distribution. d. the Poisson distribution, the binomial distribution, and the normal
What is the expected number of successes (balloons popped) when throwing 5 darts (rounded to
two decimal places)?
Select one: a. 1.41 b. 1.00 c. 2.50 d. 0.75 e. 0.50
Answer:
d
Question:
What is the probability of getting 4 or more successes (popped balloons) in 5 throws (rounded to
two decimal places)?
Select one: a. .00 b. .98 c. .07 d. .33 e. .12
Answer:
a
Question:
A Poisson distribution called Q has an expectation of 4. Which of the following R commands
would tell you the probability that a randomly selected value from Q is less than 6 and greater
than or equal to 4 (read the question carefully):
Select one: a. ppois(6, 4) - ppois(3, 4) b. ppois(6, lambda=4) - ppois(4, lambda=4) c. ppois(5, 4) -
ppois(3, 4) d. ppois(5, 4) - ppois(4, 4) e. ppois(6 - 4, lambda=4)
Answer:
c
