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The team wins 50 percent of their night games and 90 percent of their day games. According to today's newspaper, they won yesterday. What is the probability the game was played at night?
Which salesperson should be assigned to each region to minimize total time? Identify the optimal assignments and compute total minimum time.\
Determine the probability that a single light bulb lasts over 120 hours. (d) Could you use the CLT to approximate the distribution of the total lifetime of these bulbs?
A product is made up of 20 components in a series. Ten of the components have a 1/10,000 chance of failure. Five have a 3/10,000 chance for failure. Four have a 4/10,000 chance for failure. One comp
Find a 98% confidence interval for the true mean heart rate of all people with this untreated condition. Show your calculations and/or explain the process used to obtain the interval.
Assume that women's weights are normally distributed with a mean given by mu=143 lb and a standard deviation given by sigma=29 lb.
Find the probability of getting 787 or fewer plants with long stems among 1064 offspring plants. compare answers with binomial and normal approximation.
When redesigning the fighter jet ejection seats to better accommodate women, which probability is more relevant: The result from part (a) or the result from part (b)? Why?
It wants a 98% confidence level within plus or minus ten dollars of the true mean. The standard deviation is thought to be $500.00 (CTU, 2010) The determination of the sample size must be figured ou
A travel association says that the daily lodging costs for a family in the United States is $132. You work for a tourist publication, and you randomly select 10 U.S. families and find out how much e
Use the correct formula to find the probability that, out of 15 patients, exactly 11 are pleased with the service. Show your calculations or explain how you found the probability.
A coke machine fills cups to 16 oz. In fact, the amount is approximately normally distributed with a mean of 16 and a standard deviation of 1.5. What percent of the cups will have 15 oz or fewer?
In general terms, describe what time-series forecasting models are. Explain briefly why the larger number of periods included in a moving average forecast, the less well the forecast identifies rapi
It is known that an exam scores of students in STAT 2507 follow a normal distribution with a mean of 70%. What is the minimum score required for a student to be in the top 10 percent of the class?
The mean on the SAT verbal test is 505 with a standard deviation of 111. Assume the variable is normally distributed. Find the probability that the test scores are
An engineering firm is evaluating their b ack charges. they originally believed their average back charge was $1800. they are concerned that the true average is higher, which could hurt their quarte
A company manufactures calculators in batches of 64 and there is a 4% rate of defects. Find the probability of getting exactly 4 defects in a batch.
Suppose a basketball player successfully makes 70% of the free throw shots they attempt. Find the mean and variance of the number of successful throws.
An accounting professor claims that nor more than one-quarter of undergraduate business students will major in accounting. What is the probability that in a random sample of 1,200 undergraduate busi
A sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8 days. What is the 90% confidence interval for the aver
A student is preparing for an upcoming exam. The professor for the course has given the class 20 questions to study from. What is the probability that the student will get perfect on the test?
A previous study of nickels showed that the standard deviation of the weight of nickels is 150 milligrams. How many nickels does a coin counter manufacturer need to weigh so that she can be 98% conf
A certain airplane has two independent alternators to provide elctrical power. The probability that a given altenator will fail on a 1-hour flight is .02. What is the probability that (a) both will
A food snack manufacturer samples 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 10.0 and the sample standard deviation is 0.15, find the 95% confidence
Do you think that this sample might have come from a normal population? Why or why not?