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Problem: Traffic engineers observed the traffic flow at I-200 has a mean speed of 70 miles, with an SD=10 miles. The posted speed limit is 65 miles, what is the proportion of cars exceeding the limit of 65 miles. (hint: It is reasonable to assume that speed is normally distributed with mean=70, and variance =100)
The sample mean is 50, the t-critical value is 1.96, and the standard error of the sample mean is 2.
an electronics store sells an average of 60 entertainment systems per month at an average of 800 more than the cost
If we know that the length of time it takes a college student to find a parking spot in library parking lot follows a normal distribution with mean of 3.5 minutes and a standard deviation of 1 minute, determine the probability that a randomly sele..
use smallest whole number. example if the ratio was 5520209 then the expexed ration would be 6221 use smallest whole
Perform a goodness-of-fit test to determine whether the local results follow the distribution of the U.S. overall student population based on ethnicity.
According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft, 23% of all complaints in 2007 were for identity theft.
Then you travel the same distance to another point C moving at a constant speed of 120 km/h. Your average speed for the entire trip from A to C is?
The test grades at a large school have an approximately normal distribution with a mean of 50. What is the standard deviation of the data so that 80% of the students are within 12 points (above or below) the mean?
Managers from accounting department and information technology department. What is the probability that the committee will contain at least two managers from accounts departments.
If a box with square cross section is to be sent by the postal service, there are restrictions on its size such that its Volume is given by V= x²(108-4x), where x is the length of each side of the cross section (in inches).
Test, at the significance level of 0.05, whether the mean bacteria count for the plant discharge exceeds that for the upstream location.
(a) Find the generating function of the number of individuals in the first two generations. (b) Suppose that the offspring distribution is geometric with parameter p. Determine the extinction probability.
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