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Ten percent of the tickets are labeled 25%, 20% are labeled 15%, and the remaining are labeled 5%. Excluding sales tax, what is the expected actual sale for a customer wishing to purchase $200 worth
A program submitted for an assignment has a probability of 0.2 of going into an in nite loop. If it does not go into an in nite loop then its execution time is an exponential random variable X with
If you know that 48% of children born are male, what is the probability of having 2 girls and one boy in a family of 3 children. Order is unimportant, (but you want to use binomial distributions or
Thirty percent of diabetic patients admitted to a hospital have kidney problems. A sample of 10 hospital admissions of diabetics is drawn. The value x the number of people having kidney problems is
A clinical trial is conducted to compare an experimental medication to placebo to reduce the symptoms of asthma. Two hundred participants are enrolled in the study and randomized to receive either t
Among coffee drinkers, men drink of 3.2 cups per day with a standard deviation of 0.8 cups. Assume the number of coffee drinks per day follows a normal distribution.If a sample of 20 men is selected
The genes for eye color in a certain male fruit fly are (R,W). The genes for eye color in the mating female fruit fly are (R,W). Their offspring receive one gene for eye color from each parent.
A researcher collects data on two independent samples. The first group consists of 20 human subjects, has a sample mean of 4, and a variance of 5. The second group consists of 10 subjects, has a sam
A consignment contains 100 items. If a random sample of 3 items from a consignment contains 1 or more faulty items then the consignment will be rejected.
A survey of 144 retail stores revealed that the average price of a microwave was $375 with a standard error of $20 If 95% and 98% confidence intervals were developed to estimate the true cost of the
Resistors produced by a certain firm are marketed as 10-ohm resistors. However, the actual resistances of the resistors may vary. It is observed that 5% of the values are below 9.5 ohms and 10% are
U.S. Department of agriculture date reveal small farms in the USA number one million owners. Small farm data show acreage farmed per owner is normally distributed with a mean of 20 acres and a stan
A clinical trial tests a method designed to increase theprobability of conceiving a girl. In the study 516 babies wereborn, and 258 of them were girls. Use the sample data to construct a 99% confid
Assume that you plan to use a significance level of alpha=0.05 to test the claim that p1=p2. Use the given sample sizes and numbers of successes to find the z test statistic for the hypothesis test.
Telephone calls enter a switchboard at a rate of 3 calls per minute. Assume that any given no more than one call will enter and the number of calls entering the switchboard at any time interval do n
A recent study of how Americans get to work revealed the following data:
A manufacturer of window frames knows from experince that 1 percent of the production will have some type of minor defect that will require an adjustment. What is the probability that in a sample of
A sample of 31 different payroll departments found that employees worked an average of 3103 day a year with a standarddeviation of 23.8 days. What is the 90% confidence intervsl for the average days
The point estimate for a processor that world correctly for at least 1000 hours based on a sample size of 100 is .91. Find a 95% confidence interval on the point estimate.
A survey of 61,647 people included questions about office relationships. Of the respondents, 26% reported that their bosses scream at employees. Suppose you want to test the claim that more than 1/4
An aircraft has 211 seats. when someone buys a ticket for a flight, there is a .0741 probability that the person will not show up for the flight. A ticket agent accepts 233 reservations for a flight
Suppose we randomly select a sample of 64 measurements from a larger population having a mean equal to 20 and a standard deviation of 4 .
Find the area under the normal curve to the left of z= -1.57 plus the area under the normal curve to the right of z= 2.57 The combined area is (Round to four decimal places as needed)
Determine the total area under the standard normal curve in parts (a) through (c) below. (a) Find the area under the normal curve to the left of z= -1 plus the area under the normal curve to the rig
The shape of the distribution of the time required to get an oil change at a 10 minute oil change facility is unknown. However, records indicate that the mean time is 11.2 minutes and the standard d