math 1280 Final Exam
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1. 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: b
2. 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: b
3. 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: e
4. There was a very short quiz with five questions. The following table shows
the number of correct answers 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?
Select one: a. .13 b. .42 c. .55 d. .375 e. .925: b
5. 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:
6. 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 distribution. e. none of
the answers above are accurate: e
7. What is the expected number of successes (balloons popped) when throw-
ing 5 darts (rounded to two decimal places)?
Select one: a. 1.41 b. 1.00 c. 2.50 d. 0.75 e. 0.50: d
8. 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: a
9. 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
1/3
Study online at https://quizlet.com/_cl1bjz
1. 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: b
2. 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: b
3. 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: e
4. There was a very short quiz with five questions. The following table shows
the number of correct answers 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?
Select one: a. .13 b. .42 c. .55 d. .375 e. .925: b
5. 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:
6. 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 distribution. e. none of
the answers above are accurate: e
7. What is the expected number of successes (balloons popped) when throw-
ing 5 darts (rounded to two decimal places)?
Select one: a. 1.41 b. 1.00 c. 2.50 d. 0.75 e. 0.50: d
8. 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: a
9. 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
1/3
