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Imagine that a student takes a 20-item multiple choice exam. She didn't study, so all of her answers are guesses. Each item on the exam has five possible answers. What is the probability that she would not fail, i.e. she gets at least 60% correct?
Between 180 and 230 (inclusive) of the drivers in the sample regularly wear a seatbelt? Hint: Use the BINOMDIST function in Excel.
The vessel where the second reaction will take place. The times for the two reactions are independent. Find the standard deviation of the time required to complete the process.
A new process has been implemented and it is stated to have an average cycle time of 120 seconds. A sample of 50 cycles yielded an average cycle time of 115 seconds, with a standard deviation of 2 seconds.
What is the weighted mean profit per delivery - a bottling company offers three kinds of delivery service - instant, same day and within 5 days.
Find a 95% confidence interval for the mean daily caloric intake. Interpret this interval.
assume that the salaries of elementary school teachers in the united states are normally distributed with a mean of
A hypothesis test is performed to test the claim that a population proportion is greater than 0.7. Find the probability of a type II error, β, given that the true value of the population proportion is 0.72. The sample size is 50 and the significan..
Determine the upper and lower control chart limit and the lower control chart limit for various values of the fraction defective (p) in the sample taken. Assume a 99.7 % confidence.
College students are a major target for advertisements for credit cards. At a university, 65% of students surveyed said they had opened a new credit card account within the past year. If that percentage is accurate, how many students would you exp..
Determine the percentage of samples of size 4 that will have the mean scores within 35 points of the population mean score of 280.
She knows that each order for these bills costs $300 for clerical and armored car delivery costs, and that order lead time is six days. Assuming a thirty-day month, if she were to order 6,000 bills at a time, what would be the length of an order cy..
an overseas shipment of 5 foreign automobiles contains 2 that have slight paint blemishes. if an agency receives 3 of
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