Math 1280 Final Exam Questions and
Answers | 2026 Updated | 100%
Correct
Using the value of x from the prior question, what is the SD of x? -ANSWER-1.94
What is the probably that a randomly selected item from random variable L will be
greater than 0 and less than or equal to 3? -ANSWER-.57
What is the expectation of random variable L? -ANSWER-1.60
What is the variance of random variable L? -ANSWER-14.58
Which distributions are discrete? -ANSWER-Poisson, Binomial, Uniform
What is the expected number of successes when throwing 5 darts? -ANSWER-0.75
What is the probability of getting 4 or more successes in 5 throws? -ANSWER-.00
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? -ANSWER-ppois(5,4) - ppois(3,4)
At a small store, a customer enters the front door on average every 8 minutes. A prior
study indicated that the time between customers entering the front door during
weekdays follows an exponential distribution. What is the probability that the time
between customers entering the store on a weekday will be less than or equal to 7? -
ANSWER-.58
You read a research paper that applies to your industry, and it says when people are
given a list of facts about your product, they are more likely to buy your product and that
the different between the regular amount of sales and the sales when people read the
list of facts is 3 SDs. -ANSWER-Can not tell because the sample size is not given.
Answers | 2026 Updated | 100%
Correct
Using the value of x from the prior question, what is the SD of x? -ANSWER-1.94
What is the probably that a randomly selected item from random variable L will be
greater than 0 and less than or equal to 3? -ANSWER-.57
What is the expectation of random variable L? -ANSWER-1.60
What is the variance of random variable L? -ANSWER-14.58
Which distributions are discrete? -ANSWER-Poisson, Binomial, Uniform
What is the expected number of successes when throwing 5 darts? -ANSWER-0.75
What is the probability of getting 4 or more successes in 5 throws? -ANSWER-.00
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? -ANSWER-ppois(5,4) - ppois(3,4)
At a small store, a customer enters the front door on average every 8 minutes. A prior
study indicated that the time between customers entering the front door during
weekdays follows an exponential distribution. What is the probability that the time
between customers entering the store on a weekday will be less than or equal to 7? -
ANSWER-.58
You read a research paper that applies to your industry, and it says when people are
given a list of facts about your product, they are more likely to buy your product and that
the different between the regular amount of sales and the sales when people read the
list of facts is 3 SDs. -ANSWER-Can not tell because the sample size is not given.
