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An artifact is discovered at a certain site. If it has 46% of the carbon-14 it originally contained, what is the approximate age of the artifact to the nearest year? (carbon -14 decays at the
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