Average cost of living for a family
The average cost of living for a family of 4 in twelve different cities was found to be $65,351 with a standard deviation of $7711. In dollars, what is a 95% confidence interval for the true mean, m?
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The average number of miles that 80 truckers drove in a day was 550 with a standard deviation of 50 miles. What is the 99.5% confidence interval of the true mean number of miles, m, driven by all truckers?
A vending machine distributor wants to be 99.5% confident that coffee machine is dispensing correct amount of coffee to in 0.15 fluid ounces. If it is know that the standard deviation is 0.32 fluid ounces, how many cups of coffee should be measure
If original concentration of salt in tank is 2 pounds per gallon, and pure water is being added at the rate of two gallons per minute, how much salt (in pounds) is in tank after twelve minutes?
The capacior of 1F and resistor of 20 ohms are linked in series with the electromotive force E(T)=10e^{-.01t} If charge on capacitor is zero at t=0, then determine maximum charge on capicator and when it happens.
Pick five cards randomly from an ordinary deck of 52 cards. Find the probability that all come from the same suit.
Fifteen different Thursday evening programs reported that a commercial cost an average of $169, 000 with a standard deviation of $81,000. What is the 95% confidence interval for the true mean, m, correct to the nearest thousand dollars?
If the manufacturer desires to issue a guarantee so that 99% of its tires last for longer than the guaranteed lifetime, what z-score should it employ to determine that guaranteed lifetime?
Joe Henderson runs the small metal part shop. The shop has three machines- drill press, lathe, and grinder. Prepare the linear programming model for the problem.
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