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The delivery times for all food orders at a fast-food restaurant during the lunch hour are normally distributed with a mean of 12.6 minutes and a standard deviation of3.9minutes. Let x¯be the mean delivery time for a random sample of 10 orders at this restaurant. Calculate the mean and standard deviation of x¯.
Round your answers to two decimal places.
1gpa of freshmen students follows a normal distribution with mean 2.1 and standard deviation 0.6.how many freshmen will
If a class of 30 students is chosen at random from the university populaton, find the mean of the number of male students. Find the standard deviation of the number of male students.
Using the .10 level of significance, can we conclude there is a significant difference in the proportion of adults and the proportion of teens who rated the new video?
the author recorded actual temperatures along with temperatures that were predicted 5 days earlier. results are listed
What measure of central tendency is most sensitive to skewness and which is least sensitive? What are measures of central tendency used for? What are measures of dispersion used for?
Find a 95% confidence interval for the mean monthly rent for unfurnished one-bedroom apartments available for rent in this community.
a student wants to assess whether her dog muffin tends to chase her blue ball more often than she chases her red ball.
How much time should the employer allow employees to finish the job? (Round up to the nearest minute).
What is the initial velocity component in the vertical direction?
suppose that a random variable x has the probability distributionfxx 0 if x lt 0x214 if 0 greaterthanorequalto x lt
At the .05 significance level, can Macaray conclude that the population means are different? Note that you should show all 5 steps in the test of hypothesis.
Show that a Poisson PMF is the limit of a binomial PMF with n approaching infinity and p approaching zero in such a way that np = µ= constant .
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