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Fuel Consumption and Cars
The purpose of an automobile's timing belt is to provide a connection between the camshaft and the crankshaft. This allows the valves to open and close in sync with the pistons. Suppose the duration of a timing belt (in miles) can be modeled by an exponential random variable with mean 100,000 miles.
a. Find the value of λ.
b. Find the probability that a randomly selected timing belt lasts for more than 120,000 miles.
c. Find the probability that a randomly selected timing belt lasts for between 75,000 and 125,000 miles.
d. If the timing belt on a new car breaks within 70,000 miles, the dealer will install a new belt free of charge. What is the probability the dealer will be forced to install a new timing belt free of charge on a randomly selected car?
The personnel office at a large electronics firm regularly schedules job interviews and maintains records of the interviews. From the past records
(a) Compute the exponentially smoothed forecast of calls for each week. Assume an initial forecast of 50 calls in the first week and use a=0.01. What is the forecast for the 25th week?
One interesting question is are the average compa-ratios equal across salary ranges of 10K each. While compa-ratios remove the impact of grade on salaries, are they different for different pay levels, What is the data input ranged used for this que..
Basic Biostatistics is a concise, introductory text that covers biostatistical principles and focuses on the common types of data encountered in public health and biomedical fields.
A manufacturing process produces items whose weights are basically distributed. It is known that 22.57% of all the items produced, weigh between 100 grams up to the mean and 49.18% weigh from the mean up to 190 grams.
If the variability of the filling machine is reduced to 0.025 ounce, verify that this will lower the required average amount of coffee to 4.050 ounces and yet keep 98 percent of the jars above 4 ounces.
a control chart for the fraction non-conforming of muffler bearing production is maintained with a p value of 0.10 and
The effectiveness of short term relaxation and cognitive-behavioral
a. What are the mean and standard deviation of the number of online retail orders that turn out to be fraudulent? b. What is the probability that zero online retail orders will turn out to be fraudulent?
The pet-drug market is growing very rapidly. Before new pet drugs can be introduced into the market place, they must be approved by the U.S. Food and Drug Administration.
the mean annual salary for chauffeurs is 21000. a random sample of size 45 is drawn from this population. assume that
Suppose a fair coin is tossed 100 times. Is it more likely that you will get exactly 50 heads or that you will get more than 60 heads? Suppose a fair die is rolled 60 times. Is it more likely that you will get at least 20 sixes or that you will sc..
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