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MATH 1280 FINAL EXAM | QUESTIONS
AND CORRECT ANSWERS
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 -CORRECT
ANSWER- b
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 -CORRECT ANSWER- b
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 -CORRECT ANSWER- e
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 -CORRECT ANSWER- b
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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 -CORRECT ANSWER-
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 -CORRECT ANSWER- e
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 -CORRECT ANSWER- d
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 -CORRECT ANSWER- a
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):
MATH 1280 FINAL EXAM | QUESTIONS
AND CORRECT ANSWERS
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 -CORRECT
ANSWER- b
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 -CORRECT ANSWER- b
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 -CORRECT ANSWER- e
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 -CORRECT ANSWER- b
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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 -CORRECT ANSWER-
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 -CORRECT ANSWER- e
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 -CORRECT ANSWER- d
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 -CORRECT ANSWER- a
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):
