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Assume that 85% of the time the port can handle the weekly cargo volume without extending operating hours. What is the number of tons of cargo per week that will require the port to extend its opera
The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket (Bureau of Transportation Statistics website, November 2, 2012). Airfares were based on the total
Given that z is a standard normal random variable, find z for each situation (to 2 decimals).
Find the probability that he gets at least 3 emails on a particular day? What is the standard deviation of the number of emails that Tim gets in one day?
A file can have a three-letter suffix (e.g. .txt, .doc). How many different three-letter suffixes are there?
A survey of 89 students found that 48% were in favor of raising tution to pave new parking lots. The standard deviation of the sample proprortion is 7.4%. How large a sample (to the nearest person)
Sports fans tune to a local sports talk radio station according to a Poisson process with the rate of three fans every two minutes and listen it for an Exponential amount of time with the average of
A survey of 77 students found that 23% were in favor of raising tution to pave new parking lots. The standard deviation of the sample proprortion is 10%. How large a sample (to the nearest person)
It is known that 28% of clients of an investment firm have invested in derivatives, and the rest have not. Following a downturn in the economy, 95% of the clients who invested in derivatives are ban
In a recent year, scores on a standardized test for high school students with a 3.50 to 4.00 grade point average were normally distributed, with a mean of 38.7 and a standard deviation of 1.6.
Use the normal distribution of SAT critical reading scores for which the mean is 511 and the standard deviation is 115. Assume the variable x is normally distributed.
Find the minimum sample size needed, using a prior study that found that 25% of the respondents said they support abolishing the penny. (Round to the nearest whole number)
Determine the mean, the variance, and the standard deviation of the following discrete distribution:
A lot contains 15 items and 6 are defective. If two items are drawn at random from the lot, without replacement, what is the probability there is exactly one non-defective?
The following frequency table summarizes the ages of 65 shoppers at the local grocery store. Calculate the sample variance and standard deviation for this data set. (Hint: First calculate class mid-
Allegiant Airlines charges a mean base fare of $89. In addition, the airline charges for making a reservation on its website, checking bags, and inflight beverages.
Given the length an athlete throws a hammer is a normal random variable with mean 50 feet and standard deviation 5 feet, what is the probability he throws it between 42 feet and 62 feet?
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot.
University's student population of freshman and seniors was surveyed to determine if they prefer traditional textbooks or digital textbooks.
A random sample of adults in Laredo was asked how many books they typically read in a year. The following contingency table shows these results along with their age group.
Suppose the inspectors sample 100 ravioli. How does the standard deviation of the sampling distribution of the sample mean change?
A random sample of adults in El Paso was asked how many books they typically read in a year. The following contingency table shows these results along with their age group.
A random sample of homeowners from Amarillo and Lubbock was asked to identify the primary source of heat for their homes. The following contingency table shows these results.