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The median age of residents of the united states is 31 years. If a survey of 109 randomly selected united states residents is to be taken, what is the approximate probability that at least 60 will b
The outcomes of the successive trials are assumed to be independent. Find the frequency function for the total number of attempts. What is the probability that player A wins?
A uniform probability distribution is a continuous probability distribution where the probability that the random variable assumes a value in any interval of equal length is :
Suppose that replacement times for washing machines are normally distributed with a mean of 9.5 years and a standard deviation of 1.8 years. Find the replacement time that separates the top 18% from
He announces to the class that the top 15% of the scores will earn an A. What is the lowest score a student can earn and still receive an A?
The salaries of the employees of a corporation are normally distributed with a mean of $25000 and a standard deviation of $5000. What is the probability that a randomly selected employee will have
Determine what kind of graph would be appropriate for showing this distribution and sketch the frequency distribution graph.
The process is monitored using a sample size of 20. Calculate the upper and lower control limits. Give your answers to 2 decimal places.
From past records about 40% of a firm's orders are for export. Their records for export shows 48%in one particular financial quarter. if they expect to satisfy about 80 orders in the next financial
Test the hypothesis that there was no significant change in the average flexible spending amounts despite the millions of dollars forfeited. Find the probability distribution information.
At a small Midwestern college, 60% of the students are female, 70% of the female students are liberal arts majors, and 50% of the male students are liberal arts majors. A student is selected at rand
Verify that rate by beginning with a small sample of 10 randomly selected consumers, find the probability that exactly 3 of the 10 consumers recognize the name.
Seiko purchases watch stems in lots of 10,000. Seiko's sampling plan calls for checking 20 items, and if 3 or fewer are defective, the lot is accepted. Based upon their sampling plan, what is the p
a customer from a fruit stand picks a sample of 5 oranges at random from a crate containing 60 oranges, of which 6 are rotten. What is the probability that the sample contains 1 or more rotten orang
Upon receiving the rackets, the customer measured the tension of each and calculated the following summary statistics: In order to conduct the test, the customer selected a significance level of Int
The supplier has been in business many years and has a long-term defective rate for parts of only 4.3%. what is the probability that a shipment will be rejected after a given sample of parts is chec
The combined SAT scores of students are normall distributed with a mean of 950 and a standard deviation of 200.
As a bottler we want to know if the machine was underfilling. Setup Null and Alternate hypotheses to test if average amount of soda in each can is less than 32 oz. Please test the hypothesis using
The relative frequency distribution of the number of TVs sold in a day in a department store in the last year is as follows: Compute the mean and standard deviation of this distribution.
A video arcade owner believes that the average age of his customers is 12 with a standard deviation of 1.5 years. A sample of 36 customers had an average age of 12.5 years. The test value would be
If no more than 5% of the containers are to weigh less than 15.80 oz., what must the standard deviation of the weights equal?
Find the expected number of people that select their own jacket. Example 4: Shuffle an ordinary deck of 52 playing cards.
How many students must be randomly selected to estimate the mean weekly earnings of students at one college? We want 95% confidence that the sample mean.
Construct the indicated confidence interval for the difference between the two population means. Assume that the two samples are independent simple random samples selected from normally distributed
The average gas mileage of a certain model car is 28.0 miles per gallon. If the gas mileages are normally distributed with a standard deviation of 0.45 miles per gallon, find the probablilty that a