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Please give all values of b in the following equations that will give one or more real number solutions?
a) 3x^2 + bx - 3 = 0
b) 5x^2 + bx + 1 = 0
c) -3x^2 + bx - 3 = 0
d) Write a rule for judging if an equation has solutions by looking at it in standard form.
Martin Motors has in stock three cars of the same make and model. The president would like to compare the gas consumption of the three cars (labeled car A, car B, and car C) using four different types of gasoline.
What is the probability that more than 265 will be relieved of the nasal condition?
A voltmeter is used to measure a known voltage of 100 V. Forty percent of the readings are within 0.5 V of the true value. Estimate the standard deviation for the meter.
In baseball, a "no-hitter" is a regulation 9-inning game in which the pitcher yields no hits to the opposing batters. Chance (Summer, 1994) reported on a study of no-hitters in Major League Baseball (MLB).
A sample of the length of time it took 42 persons to assemble the unit was organized into the following frequency distribution. What is the standard deviation (in minutes)?
What is the value of the population mean? What is the best estimate of this value?
Average (arithmetic mean) of 15 years with a standard deviation of 4 years. How does the relative dispersion in the distribution of salaries compare with that of the lengths of service?
A personal computer manufacturer is interested in comparing assembly times for two keyboard assembly processes. Assembly times can vary considerably from worker to worker, and the company decides to eliminate this effect by selecting a random samp..
Develop a trend line for the demand for fertilizer using computer software. Data collected on the yearly demand for 50 pound bags of fertilizer at Wallace Garden Supply are shown in the following table:
What would be the most appropriate graphical representation to show the dispersion of new home prices in a particular area? Why?
If it is determined that there is no difference between the population mean being represented by the sample and the mean of the population at large, then:
Commonwealth Edison wants to identify its heaviest users, which are those that are in the top 6% of electric consumption. How many kilowatt hours in January would qualify for the heavy user classification?
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