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Question: Suppose that the standard deviation of the tube life for a particular brand of TV picture tube is known to be s = 500, but that the mean operating life is not known. Overall, the operating life of the tubes is assumed to be approximately normally distributed. For a sample of n = 15, the mean operating life is X = 8,900 hr. Determine
(a) the 95 percent and
(b) the 90 percent confidence intervals for estimating the population mean.
They guarantee to give you a 10% raise next month. Discuss this situation. Will your next month's salary stay the same? Explain your answer using an example.
If an open box has a square base and a volume of 105 in.3 and is constructed from a tin sheet, find the dimensions of the box, assuming a minimum amount of material is used in its construction.
A woman has a 28-in. waist and 34-in. hips. Write the waist-to-hip ratio as a decimal, rounded to the nearest hundredth.
The Friendly Sausage Factory (FSF) can produce hot dogs at a rate of 5,000 per day. FSF suppies hot dogs to local restaurants at a steady rate of 250 per day.
draw a gantt chart that shows how the following five classes can be scheduled into two classrooms a and bnbsp business
Find the expected payback for the games of chance described in exercise, In one form of roulette, you bet $1 on "even." If 1one of the 18 even numbers comes up, you get your dollar back, plus another one. If 1 of the 20 noneven (18 odd, 0, and 00)..
Natural disasters and wars are crises that impact every type of economy, regardless of economic system. All types of economic systems struggle to respond quickly to such destruction.
Births Records of random selected births were obtained a categorized according to the day of the week that they occurred (based on data from the National Center for Health Statistics). Because babies are unfamiliar our schedule of weekdays, a reas..
The density of the pyramid is uniform in cross-sections parallel to the base, and density (in g/cm3) across such a cross section if twice the distance (in cm) from the top of the pyramid. Compute the mass of the pyramid.
A principal of $4900 is invested at 7.75% interest, compounded annually. How much will the investment be worth after 8 years? Use the calculator provided and round your answer to the nearest dollar.
Write out the probability distribution for of sales during a five-day week. What is the mean and variance of this distribution? Assume that the profit from each sale is $750 for the situation in additional problem. What is the expected weekly profi..
A two-person game is played in which a fair coin is tossed until either the sequence HT (heads, tails) or the sequence TT (tails, tails) appears.
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