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Lifetime of a washing machine
The lifetime of a certain manufacturer's washing machine is normally distributed with mean 4 years. Only 15% of all these washing machines last at least 5 years. What is the standard deviation of the lifetime of a washing machine made by this manufacturer? 2. You have been told that the distribution of regular unleaded gasoline prices over all gas stations in Indiana is normally distributed with mean $2.95 and standard deviation $0.075, and you have been asked to find two dollar values such that 95% of all gas stations charge somewhere between these two values. Why is each of the following an acceptable answer: between $2.776 and $3.081, or between $2.803 and $3.097? Can you find any other acceptable answers? Which of the many possible answers would you give if you are asked to obtain the shortest interval.
Aaron bought 6 books and 2 notebooks for $46.86. Erin bought 2 books and 6 notebooks for$27.78. How much does one book cost?
A fitness ball id delivered in a flat package with a hand pump. The pump inflates the ball at 280cmcubed per pump, to a diameter of 28cm. How many pumps are needed to inflate the ball? Explain how you got your answer.
Estimate that the interest rate might increase or decrease by as much as one percentage point. Also, the price of the house might increase by as much as $10,000-it certainly won't decrease.
A ternary word is a word formed from the alphabet P = {0, 1, 2}. Considerthe set of all ternary words of length n. If such a word is chosen at random,determine an expression (in terms of n) for the probability that this worddoes not contain the bit p..
Give the critical region, test statistic value, & conclusion for the F test.
A window is constructed from a rectangular sheet of glass of height h with a semicircular piece of glass at each end of radius r.
Find the cars maximum possible(limiting)velocity. Find how long it takes the car to attain 90% of the limiting velocity, and how far it travels while doing so.
A garden table and a bench cost $667 combined. The garden table costs $83 less than the bench. What is the cost of the bench?
Important information about Mixture, A tank contains 1320L of pure water.A solution that contains .o1kg of sugar per liter enters a tank at the rate 3L/min
Explain the four steps for solving quadratic equations. Can any of these steps be eliminated?
How fast is the radius decreasing at the min moment when radius is 10 cm? Express the answer in exact form, using appropriate units.
At 80 Fahrenheit they chirp about 172 times per minute. Find the linear equation relating Fahrenheit temperature F and the number of chirps C.
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