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Develop a probability tree showing all marginal, conditional and joint probabilities.
The average weight of a football player is 225 pounds with a standard deviation of 20 pounds. What is the probability of a player weighing more than 260 pounds.
Find the minimum sample size your should use to assure that your estimate of p will be within the required margin of error around the population p.
The probability that a vehicle entering the Luray Caverns has Canadian license plates is 0.12; the probability that it is a camper is 0.28; and the probability that it is a camper with Canadian lice
The probability of a player weighing more than 241.25 pounds on a team with the mean weight of 200 pounds and a standard deviation of 25 pounds is ??
Find the probability that the time taken for a randomly chosen customer to be dealt with by a cashier is more than 180s.
In a non instanteneous receipt model, daily demand is 55 units and daily production is 120 units, Co=$70 and Cc=$4 per unit per year. What is the maximum inventory level? (Assume that the facility i
The prior year, the population mean expenditure per household was $632. Discuss the change in holiday season expenditures over the one year period.
A poll is planned to determine what proportion of all students favor an increase in fees to support a new track and field stadium. A questionnaire will be published and the first 1000 completed que
A car insurance company has recorded the number of claims for the past quarter by age and gender. If a claim is randomly selected, what is the probability the person was under 25 or male?
The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a defective calculator is 10%. If 15 calculators are selected at random, what is the probability that 4 or more
Suppose the life span a cell phone is normally distributed with a mean of 5 years and a standard deviation of 9 years. The company gurantees that any cell phone which malfunctions within 3 years of
A local fast-food restaurant has determined that 10% of drive-thru orders are filled incorrectly. Suppose 5 orders are randomly selected. What is the probability that more than one of the orders is
A random sample of 121 checking accounts at a bank showed an average daily balance of $280. The population standard deviation is known to be $60. Is it necessary to know anything about the shape of
The springs did not meet specifications. Construct a 99% confidence interval for the population proportion of springs that do not meet specifications.
What is the slope of the least-squares regression line of final-exam scores on pre-exam total scores in this course? (Use 2 decimal places.)
A sample of 500 donations to the Arthritis Foundation is reported in the following frequency distribution. Is it reasonable to conclude that the distribution is normally distributed with a mean of $
A sample of 81 observations is selected from a normal population with a standard deviation of 5. The sample mean is 40. Determine the 95% confidence interval for the population mean.
A die is rolled and a coin is tossed. Find the probability that: a. the die's number is even and the coin toss results in heads b. the die comes up 6 and the coin comes up heads
What is the value of the optimal solution if the annual return of Huber Steel changes from $5 to $2 (everything else stays the same)? What is the value of the total return?
If the MPG (mileage per gallon) for a mid-size car is assumed to be normally distributed with a mean of 22 and a standard deviation of 3 MPG. What proportion of mid-size cars would have less than 2
What is the probability that a randomly chosen U.S. adult invests in stocks, given that s/he invests in fixed income instruments? Round your answer to decimal places.
Use a 0.01 significance level to test the claim that the selection process is biased against Americans of Mexican ancestry. Does the jury system appear to be fair?
It is reported that 60% of a certain larg epopulation eat a certain brand of cereal. We randomly select 25 individuals from this population. Let X be the number of people who eat this certain brand
what percentage of cars are exceeding the speed Limit? If police decide to ticket cars exceeding 72mph what percentage of the motorist are ticketed?