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Based on a survey of 1,000 adults by Greenfield Online and reported in a May 2009 USA Today Snapshot, adults 24 years of age and under spend a weekly average of $35 on fast food. If 200 of the adults surveyed were in the age category of 24 and under and they provided a standard deviation of $14.50, construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under. Assume fast food weekly expenditures are normally distributed.
airplane a takes off 60 minutes after airplane a and heads in the same direction. if airplane a travels with a constant velocity of 408 mph and airplane b with a constant velocity of 1554 mph, in how many hours will airplane b catch up to airplane..
Find the principal amount
Suppose that f is continuous on [a,b]. Prove that f is integrable, i.e., ( the integral symbol with b at top and a at the bottom) f exists.
You have just cut an 89 foot length of rope into three segments. The second segment is twice as long as the first segment, and the third segment is 4 feet longer than the second segment. How long is the third segment?
Probability - independence of 2 events. Prove that if A and B are independent events in a probability space, then the events A^c and B^c are also independent.
Examples of the product rule of exponents: Sometimes when students see the rule they want to write it as 4^2 + 4^3 = 4^5. Can you explain why this does not work?
A surveyor is 305 ft from the base of the new courthouse. Her angle-measuring device is 5 ft above the ground. The angle of elevation to the top of the courthouse is 42º. Find the height of the courthouse to the nearest foot.
He has invented a counter for his bike, which counts the number of revolutions the wheels make. One day the counter shows 330 revolutions. how far has billy cycled?
Resistors R1, and R2, have resistances of 50.0 Ohms, and 10.0 Ohms. R1 and R2 are connected in series-parallel circuit. What is the total resistance in ohms?
Write two expressions--one for labor and one for materials--that can be used to model the labor and materials constraints for the upcoming week.
For the normal distribtion, the mean plus and minus 1.96 standard deviation will include what percent of the observations? What is the formula to calculate the percentage?
Find the probability that the first card is a king and the second card is a queen.
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