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The time it takes a student to finish a electronics test has a uniform distribution between 50 and 70 minutes.
(1) What is the probability density function for this uniform distribution?
(2) Find the probability that a student will take more than 60 minutes to finish the test.
(3) Find the probability that a student will take no less than 55 minutes to finish the test.
(4) Find the probability that a student will take exactly one hour to finish the test.
(5) What is the median amount of time it takes a student to finish the test?
(6) What is the mean amount of time it takes a student to finish the test?
To sketch the 3-sigma X-bar chart and R-chart parameters. A candy bar manufacturer desires to set up a variables control chart for the net weight of its candy bars.
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 Inches and a standard deviation of 0.01 inches.
A safety engineer claims that only 40% of all workers wear safety helmets when they eat lunch at the workplace. Assuming that his claim is right, find the probability that at most 4 out of 6 workers randomly chosen will be wearing their helmets wh..
Find out best decision, by using following decision criteria.
Any person who is familiar with these trees understand the height of a California redwood tree which is related to another characteristics of the tree.
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Use this information to set up a 90 percent confidence interval for the proportion, p of all US workers who play hooky.
Iit is known that signal change in this brain area is normally distributed with mean of 35 and standard deviation of 10. By using .01 level, what must researcher conclude?
What characteristic (or property of random samples) could be observed during the sampling process?
Dr. Richmond, a psychologist, is studying the daytime television viewing habits of college students.
The mean return for a random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Build a 95 percent confidence interval for mu, population mean.
Construct a 90 percent confidence interval for the true mean weight. Describe factors which might cause variation in the weight of Tootsie Rolls during manufacture.
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