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The life expectancy of computer terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months.
a. What is the probability that a randomly selected terminal will last more than 5 years?b. What percentage of terminals will last between 5 and 6 years?c. What percentage of terminals will last less than 4 years?d. What percentage of terminals will last between 2.5 and 4.5 years?e. If the manufacturer guarantees the terminals for 3 years (and will replace them if they malfunction), what percentage of terminals will be replaced?
Death would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excessive?
If you randomly select ten m&m's, what is the probability that exactly three of them are green?
Porphyrin is a pigment in blood protoplasm and other body fluids that is significant in body energy and storage. Let x be a random variable that represents the number of milligrams of porphyrin per deciliter of blood.
Company are interested in how a new spaghetti sauce made from green tomatoes (and green in color) will compare to their traditional red spaghetti sauce. They are worried that the green color will adversely affect the tastiness scores.
In a speech to the Chamber of Commerce, a city councilman claims that in his city less than 15% of the adult male population is unemployed.
Estimate the population means growth in 1 year for 14-year-old boys. Make a point estimate and an 80% confidence interval estimate.
Jolly Blue Giant Health Insurance is concerned about rising lab test costs and would like to know. Determine the essential sample size?
Can you think of a policy; political, economic, social, or otherwise, that pushes people toward avoiding one type or another?
An HMO is considering a marketing plan targeting patients with chronic diseases to increase the number getting a flu shot. Some preliminary analyses are conducted before implementing such a plan.
State the appropriate hypotheses. Obtain a test statistic and p-value. Interpret the results at ? = .01. Is normality assured? Is the difference large enough to be important?
Round the intermediate values to 2 decimal places. Round your answer to 2 decimal places, the tolerance is +/-0.05. Type of music preferred is independent or not independent of region of the country?
Find out correlation coefficient r, If student take 35 minutes to complete exam, what is his predicted score.
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